US2004018618A1PendingUtilityA1

Interleukin-3 (IL-3) mutant polypeptides

34
Priority: Nov 24, 1992Filed: Jun 19, 2002Published: Jan 29, 2004
Est. expiryNov 24, 2012(expired)· nominal 20-yr term from priority
Y10S930/141C07K 2319/02A61P 7/00C07K 2319/00A61P 43/00A61K 38/00C07K 14/5403C07K 14/54C12N 15/11
34
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Claims

Abstract

The present invention relates to recombinant human interleukin-3 (hIL-3) variant or mutant proteins (muteins). These hIL-3 muteins contain amino acid substitutions and may also have amino acid deletions at both the N- and C-termini. The invention also relates to pharmaceuical compositions containing the hIL-3 muteins and methods for using them. Additionally, the present invention relates to recombinant expression vectors comprising nucleotide sequences encoding the hIL-3 muteins, related microbial expression systems, and processes for making the hIL-3 muteins using the microbial experession systems. Included in the presnt invention are deletion mutants of hIL-3 in which from 1 to 14 amino acids have been deleted from the N-terminus, and from 1 to 15 amino acids (a.a. 119 to 133) have been deleted from the C-terminus, and which also contain amino acid substitutions in the polypeptide. These hIL-3 multiple mutation polypeptides may have biological activities similar to or better than hIL-3 and, in some cases, may also have an improved side effect profile.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . Cultured stem cells obtained by a method for selective ex-vivo expansion of stem cells, comprising the steps of; (a) separating stem cells from other cells; (b) culturing the separated stem cells with a selected media which comprises; 
 a human interleukin-3 mutant polypeptide of the Formula:                              Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn   [SEQ ID NO:15]          1               5                  10                   15           Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      20                 25                   30           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa                      35                 40                   45           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      50                 55                   60           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      65                 70                   75           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      80                 85                   90           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      95                 100                 105           Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      110                115                 120           Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe                      125                130                                                  wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;    Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;    Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;    Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;    Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;    Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;    Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;    Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;    Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;    Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;    Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;    Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;    Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;    Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;    Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;    Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;    Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;    Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;    Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;    Xaa at position 36 is Asp, Leu, or Val;    Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;    Xaa at position 38 is Asn, or Ala;    Xaa at position 40 is Leu, Trp, or Arg;    Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;    Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;    Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;    Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;    Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;    Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;    Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;    Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;    Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;    Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;    Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;    Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;    Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;    Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;    Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;    Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;    Xaa at position 57 is Asn or Gly;    Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;    Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;    Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;    Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;    Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;    Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;    Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;    Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;    Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;    Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;    Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;    Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;    Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;    Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;    Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;    Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;    Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;    Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;    Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;    Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;    Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;    Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;    Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;    Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;    Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;    Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;    Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;    Xaa at position 85 is Leu, Asn, Val, or Gln;    Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;    Xaa at position 87 is Leu, Ser, Trp, or Gly;    Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;    Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;    Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;    Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;    Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;    Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;    Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;    Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;    Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;    Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;    Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;    Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;    Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;    Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;    Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;    Xaa at position 103 is Asp, or Ser;    Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;    Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;    Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;    Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;    Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;    Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;    Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;    Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;    Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;    Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;    Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;    Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;    Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;    Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;    Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;    Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;    Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;    Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;    Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;    and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus; and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ); and 
 (c) harvesting said cultured cells.  
   
     
     
         2 . Cultured stem cells obtained by a method for selective ex-vivo expansion of stem cells, comprising the steps of; (a) separating stem cells from other cells; (b) culturing the separated stem cells with a selected media which comprises; 
 a human interleukin-3 mutant polypeptide of the Formula:                              Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa   [SEQ ID NO:19]          1                5                 10                   15           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa                      20                 25                   30           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      35                 40                   45           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      50                 55                   60           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      65                 70                   75           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      80                 85                   90           Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      95                100                  105           Xaa Xaa Xaa Xaa Gln Gln                     110                                               wherein    Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;    Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;    Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;    Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;    Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;    Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;    Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;    Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;    Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;    Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;    Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;    Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;    Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;    Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;    Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;    Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;    Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;    Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;    Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;    Xaa at position 22 is Asp, Leu, or Val;    Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;    Xaa at position 24 is Asn, or Ala;    Xaa at position 26 is Leu, Trp, or Arg;    Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;    Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;    Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;    Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;    Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;    Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;    Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;    Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;    Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;    Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;    Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;    Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;    Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;    Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;    Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;    Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;    Xaa at position 43 is Asn or Gly;    Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;    Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;    Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;    Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;    Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;    Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;    Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;    Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;    Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;    Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;    Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;    Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;    Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;    Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;    Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;    Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;    Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;    Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;    Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;    Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;    Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;    Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;    Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;    Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;    Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;    Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;    Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;    Xaa at position 71 is Leu, Asn, Val, or Gln;    Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;    Xaa at position 73 is Leu, Ser, Trp, or Gly;    Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;    Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;    Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;    Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;    Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;    Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;    Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;    Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;    Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;    Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;    Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;    Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;    Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;    Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;    Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;    Xaa at position 89 is Asp, or Ser;    Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;    Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;    Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;    Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;    Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;    Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;    Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;    Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;    Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;    Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;    Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;    Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;    Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;    Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;    Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;    Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;    Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;    Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;    Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;    and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ); and 
 (c) harvesting said cultured cells.  
   
     
     
         3 . The method according to  claim 1 , wherein said human interleukin-3 mutant polypeptide is of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                          1               5                  10 
                     
                     
                 
                   (Met) m -Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr 
                   [SEQ ID NO:129] 
                 
                     
                 
                               15                 20 
                 
                   Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 
                 
                     
                 
                   25                  30                 35 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                           40                  45             50 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 
                 
                     
                 
                                   55                 60 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                       65                  70              75 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                               80                  85 
                 
                   Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 
                 
                     
                 
                   90                  95                 100 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                           105                110                 115 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                                   120                125 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 
                 
                     
                 
                       130 
                 
                   Ser Leu Ala Ile Phe 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; Xaa at position 18 is Asn or Ile; Xaa at position 19 is Met, Ala or Ile; Xaa at position 20 is Ile, Pro or Leu; Xaa at position 23 is Ile, Ala or Leu; Xaa at position 25 is Thr or His; Xaa at position 29 is Gln, Arg, Val or Ile; Xaa at position 32 is Leu, Ala, Asn or Arg; Xaa at position 34 is Leu or Ser; Xaa at position 37 is Phe, Pro, or Ser; Xaa at position 38 is Asn or Ala; Xaa at position 42 is Gly, Ala, Ser, Asp or Asn; Xaa at position 45 is Gln, Val, or Met; Xaa at position 46 is Asp or Ser; Xaa at position 49 is Met, Ile, Leu or Asp; Xaa at position 50 is Glu or Asp; Xaa at position 51 is Asn Arg or Ser; Xaa at position 55 is Arg, Leu, or Thr; Xaa at position 56 is Pro or Ser; Xaa at position 59 is Glu or Leu; Xaa at position 60 is Ala or Ser; Xaa at position 62 is Asn, Val or Pro; Xaa at position 63 is Arg or His; Xaa at position 65 is Val or Ser; Xaa at position 67 is Ser, Asn, His or Gln; Xaa at position 69 is Gln or Glu; Xaa at position 73 is Ala or Gly; Xaa at position 76 is Ser, Ala or Pro; Xaa at position 79 is Lys, Arg or Ser; Xaa at position 82 is Leu, Glu, Val or Trp; Xaa at position 85 is Leu or Val; Xaa at position 87 is Leu, Ser, Tyr; Xaa at position 88 is Ala or Trp; Xaa at position 91 is Ala or Pro; Xaa at position 93 is Pro or Ser; Xaa at position 95 is His or Thr; Xaa at position 98 is His, Ile, or Thr; Xaa at position 100 is Lys or Arg; Xaa at position 101 is Asp, Ala or Met; Xaa at position 105 is Asn or Glu; Xaa at position 109 is Arg, Glu or Leu; Xaa at position 112 is Thr or Gln; Xaa at position 116 is Lys, Val, Trp or Ser; Xaa at position 117 is Thr or Ser; Xaa at position 120 is Asn, Gln, or His; Xaa at position 123 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         4 . The method according to  claim 2 , wherein said human interleukin-3 mutant polypeptide is of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                                1              5               10 
                     
                     
                 
                   (Met m -Ala n ) p -Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile 
                   [SEQ ID NO:130] 
                 
                     
                 
                                   15                  20 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                        25                 30                 35 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 
                 
                     
                 
                               40                 45 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                   50                  55                 60 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                           65                  70                 75 
                 
                   Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 
                 
                     
                 
                                   80                  85 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                       90                  95                   100 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                               105                110 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; n is 0 or 1; p is 0 or 1; Xaa at position 4 is Asn or Ile; Xaa at position 5 is Met, Ala or Ile: Xaa at position 6 is Ile, Pro or Leu; Xaa at position 9 is Ile, Ala or Leu; Xaa at position 11 is Thr or His; Xaa at position 15 is Gln, Arg, Val or Ile; Xaa at position 18 is Leu, Ala, Asn or Arg; Xaa at position 20 is Leu or Ser; Xaa at position 23 is Phe, Pro, or Ser; Xaa at position 24 is Asn or Ala; Xaa at position 28 is Gly, Ala, Ser, Asp or Asn; Xaa at position 31 is Gln, Val, or Met; Xaa at position 32 is Asp or Ser; Xaa at position 35 is Met, Ile or Asp; Xaa at position 36 is Glu or Asp; Xaa at position 37 is Asn, Arg or Ser; Xaa at position 41 is Arg, Leu, or Thr; Xaa at position 42 is Pro or Ser; Xaa at position 45 is Glu or Leu; Xaa at position 46 is Ala or Ser; Xaa at position 48 is Asn, Val or Pro; Xaa at position 49 is Arg or His; Xaa at position 51 is Val or Ser; Xaa at position 53 is Ser, Asn, His or Gln; Xaa at position 55 is Gln or Glu; Xaa at position 59 is Ala or Gly; Xaa at position 62 is Ser, Ala or Pro; Xaa at position 65 is Lys, Arg or Ser; Xaa at position 67 is Leu, Glu, or Val; Xaa at position 68 is Leu, Glu, Val or Trp; Xaa at position 71 is Leu or Val; Xaa at position 73 is Leu, Ser or Tyr; Xaa at position 74 is Ala or Trp; Xaa at position 77 is Ala or Pro; Xaa at position 79 is Pro or Ser; Xaa at position 81 is His or Thr; Xaa at position 84 is His, Ile, or Thr; Xaa at position 86 is Lys or Arg; Xaa at position 87 is Asp, Ala or Met; Xaa at position 91 is Asn or Glu; Xaa at position 95 is Arg, Glu Leu; Xaa at position 98 Thr or Gln; Xaa at position 102 is Lys, Val, Trp or Ser; Xaa at position 103 is Thr or Ser; Xaa at position 106 is Asn, Gln, or His; Xaa at position 109 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         5 . A method of human gene therapy, comprising the steps of; (a) culturing said separated stem cells with a selected media comprising; 
 a human interleukin-3 mutant polypeptide of the Formula:                              Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn   [SEQ ID NO:15]          1                5                 10                  15           Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       20                25                  30           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa                       35                40                  45           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       50                55                  60           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       65                70                  75           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       80                85                  90           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       95                100                 105           Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      110                115                 120           Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe                      125                130                                                  wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;    Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;    Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;    Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;    Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;    Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;    Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;    Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;    Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;    Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;    Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;    Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;    Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;    Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;    Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;    Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;    Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;    Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;    Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;    Xaa at position 36 is Asp, Leu, or Val;    Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;    Xaa at position 38 is Asn, or Ala;    Xaa at position 40 is Leu, Trp, or Arg;    Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;    Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;    Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;    Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;    Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;    Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;    Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;    Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;    Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;    Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;    Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;    Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;    Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;    Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;    Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;    Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;    Xaa at position 57 is Asn or Gly;    Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;    Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;    Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;    Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;    Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;    Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;    Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;    Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;    Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;    Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;    Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;    Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;    Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;    Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;    Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;    Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;    Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;    Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;    Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;    Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;    Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;    Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;    Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;    Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;    Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;    Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;    Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;    Xaa at position 85 is Leu, Asn, Val, or Gln;    Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;    Xaa at position 87 is Leu, Ser, Trp, or Gly;    Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;    Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;    Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;    Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;    Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;    Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;    Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;    Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;    Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;    Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;    Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;    Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;    Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;    Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;    Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;    Xaa at position 103 is Asp, or Ser;    Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;    Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;    Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;    Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;    Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;    Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;    Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;    Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;    Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;    Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;    Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;    Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;    Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;    Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;    Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;    Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;    Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;    Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;    Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;    and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus; and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ); 
 (d) harvesting said cultured cells; and  
 (e) transplanting said cultured cells into said patient.  
   
     
     
         6 . A method of human gene therapy, comprising the steps of; (a) culturing said separated stem cells with a selected media comprising; 
 a human interleukin-3 mutant polypeptide of the Formula:                              Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa   [SEQ ID NO:19]          1                5                 10                  15           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa                       20                25                  30           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       35                40                  45           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       50                55                  60           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       65                70                  75           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       80                85                  90           Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       95                100                 105           Xaa Xaa Xaa Xaa Gln Gln                      110                                               wherein    Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;    Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;    Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;    Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;    Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;    Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;    Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;    Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;    Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;    Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;    Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;    Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;    Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;    Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;    Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;    Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;    Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;    Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;    Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;    Xaa at position 22 is Asp, Leu, or Val;    Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;    Xaa at position 24 is Asn, or Ala;    Xaa at position 26 is Leu, Trp, or Arg;    Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;    Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;    Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;    Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;    Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;    Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;    Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;    Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;    Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;    Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;    Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;    Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;    Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;    Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;    Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;    Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;    Xaa at position 43 is Asn or Gly;    Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;    Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;    Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;    Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;    Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;    Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;    Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;    Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;    Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;    Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;    Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;    Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;    Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;    Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;    Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;    Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;    Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;    Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;    Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;    Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;    Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;    Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;    Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;    Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;    Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;    Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;    Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;    Xaa at position 71 is Leu, Asn, Val, or Gln;    Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;    Xaa at position 73 is Leu, Ser, Trp, or Gly;    Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;    Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;    Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;    Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;    Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;    Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;    Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;    Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;    Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;    Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;    Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;    Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;    Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;    Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;    Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;    Xaa at position 89 is Asp, or Ser;    Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;    Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;    Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;    Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;    Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;    Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;    Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;    Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;    Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;    Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;    Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;    Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;    Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;    Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;    Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;    Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;    Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;    Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;    Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;    and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ); 
 (d) harvesting said cultured cells; and  
 (e) transplanting said cultured cells into said patient.  
   
     
     
         7 . The method according to  claim 5 , wherein said human interleukin-3 mutant polypeptide is of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                          1               5                  10 
                   [SEQ ID NO:129] 
                     
                 
                   (Met) m -Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr 
                 
                     
                 
                               15                 20 
                 
                   Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 
                 
                     
                 
                   25                  30                 35 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                           40                  45             50 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 
                 
                     
                 
                                   55                 60 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                       65                  70              75 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                               80                  85 
                 
                   Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 
                 
                     
                 
                   90                  95                 100 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                           105                110                 115 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                                   120                125 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 
                 
                     
                 
                       130 
                 
                   Ser Leu Ala Ile Phe 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; Xaa at position 18 is Asn or Ile; Xaa at position 19 is Met, Ala or Ile; Xaa at position 20 is Ile, Pro or Leu; Xaa at position 23 is Ile, Ala or Leu; Xaa at position 25 is Thr or His; Xaa at position 29 is Gln, Arg, Val or Ile; Xaa at position 32 is Leu, Ala, Asn or Arg; Xaa at position 34 is Leu or Ser; Xaa at position 37 is Phe, Pro, or Ser; Xaa at position 38 is Asn or Ala; Xaa at position 42 is Gly, Ala, Ser, Asp or Asn; Xaa at position 45 is Gln, Val, or Met; Xaa at position 46 is Asp or Ser; Xaa at position 49 is Met, Ile, Leu or Asp; Xaa at position 50 is Glu or Asp; Xaa at position 51 is Asn Arg or Ser; Xaa at position 55 is Arg, Leu, or Thr; Xaa at position 56 is Pro or Ser; Xaa at position 59 is Glu or Leu; Xaa at position 60 is Ala or Ser; Xaa at position 62 is Asn, Val or Pro; Xaa at position 63 is Arg or His; Xaa at position 65 is Val or Ser; Xaa at position 67 is Ser, Asn, His or Gln; Xaa at position 69 is Gln or Glu; Xaa at position 73 is Ala or Gly; Xaa at position 76 is Ser, Ala or Pro; Xaa at position 79 is Lys, Arg or Ser; Xaa at position 82 is Leu, Glu, Val or Trp; Xaa at position 85 is Leu or Val; Xaa at position 87 is Leu, Ser, Tyr; Xaa at position 88 is Ala or Trp; Xaa at position 91 is Ala or Pro; Xaa at position 93 is Pro or Ser; Xaa at position 95 is His or Thr; Xaa at position 98 is His, Ile, or Thr; Xaa at position 100 is Lys or Arg; Xaa at position 101 is Asp, Ala or Met; Xaa at position 105 is Asn or Glu; Xaa at position 109 is Arg, Glu or Leu; Xaa at position 112 is Thr or Gln; Xaa at position 116 is Lys, Val, Trp or Ser; Xaa at position 117 is Thr or Ser; Xaa at position 120 is Asn, Gln, or His; Xaa at position 123 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         8 . The method according to  claim 6 , wherein said human interleukin-3 mutant polypeptide is of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                                1              5               10 
                   [SEQ ID NO:130] 
                     
                 
                   (Met m -Ala n ) p -Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile 
                 
                     
                 
                                   15                  20 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                        25                 30                 35 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 
                 
                     
                 
                               40                 45 
                 
                   Xaa Asn Lou Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                   50                  55                 60 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                           65                  70                 75 
                 
                   Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 
                 
                     
                 
                                   80                  85 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                       90                  95                   100 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                               105                110 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; n is 0 or 1; p is 0 or 1; Xaa at position 4 is Asn or Ile; Xaa at position 5 is Met, Ala or Ile: Xaa at position 6 is Ile, Pro or Leu; Xaa at position 9 is Ile, Ala or Leu; Xaa at position 11 is Thr or His; Xaa at position 15 is Gln, Arg, Val or Ile; Xaa at position 18 is Leu, Ala, Asn or Arg; Xaa at position 20 is Leu or Ser; Xaa at position 23 is Phe, Pro, or Ser; Xaa at position 24 is Asn or Ala; Xaa at position 28 is Gly, Ala, Ser, Asp or Asn; Xaa at position 31 is Gln, Val, or Met; Xaa at position 32 is Asp or Ser; Xaa at position 35 is Met, Ile or Asp; Xaa at position 36 is Glu or Asp; Xaa at position 37 is Asn, Arg or Ser; Xaa at position 41 is Arg, Leu, or Thr; Xaa at position 42 is Pro or Ser; Xaa at position 45 is Glu or Leu; Xaa at position 46 is Ala or Ser; Xaa at position 48 is Asn, Val or Pro; Xaa at position 49 is Arg or His; Xaa at position 51 is Val or Ser; Xaa at position 53 is Ser, Asn, His or Gln; Xaa at position 55 is Gln or Glu; Xaa at position 59 is Ala or Gly; Xaa at position 62 is Ser, Ala or Pro; Xaa at position 65 is Lys, Arg or Ser; Xaa at position 67 is Leu, Glu, or Val; Xaa at position 68 is Leu, Glu, Val or Trp; Xaa at position 71 is Leu or Val; Xaa at position 73 is Leu, Ser or Tyr; Xaa at position 74 is Ala or Trp; Xaa at position 77 is Ala or Pro; Xaa at position 79 is Pro or Ser; Xaa at position 81 is His or Thr; Xaa at position 84 is His, Ile, or Thr; Xaa at position 86 is Lys or Arg; Xaa at position 87 is Asp, Ala or Met; Xaa at position 91 is Asn or Glu; Xaa at position 95 is Arg, Glu Leu; Xaa at position 98 Thr or Gln; Xaa at position 102 is Lys, Val, Trp or Ser; Xaa at position 103 is Thr or Ser; Xaa at position 106 is Asn, Gln, or His; Xaa at position 109 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interieukin-3.  
     
     
         9 . Transduced stem cells obtained by the method of claims  5 ,  6 ,  7 , or  8 .  
     
     
         10 . A replicatable vector comprising a nucleic acid molecule encoding a human interleukin-3 mutant polypeptide of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                   Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn 
                   [SEQ ID NO:15] 
                     
                 
                    1               5                  10                  15 
                 
                     
                 
                   Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    20                 25                  30 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    35                 40                  45 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    50                 55                  60 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    65                 70                  75 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    80                 85                  90 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    95                 100                 105 
                 
                     
                 
                   Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                   110                 115                 120 
                 
                     
                 
                   Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe 
                 
                                   125                 130 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
         wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;  
         Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;  
         Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;  
         Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;  
         Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;  
         Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;  
         Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;  
         Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;  
         Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;  
         Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;  
         Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;  
         Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;  
         Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;  
         Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;  
         Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;  
         Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;  
         Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;  
         Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;  
         Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;  
         Xaa at position 36 is Asp, Leu, or Val;  
         Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;  
         Xaa at position 38 is Asn, or Ala;  
         Xaa at position 40 is Leu, Trp, or Arg;  
         Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;  
         Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;  
         Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;  
         Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;  
         Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;  
         Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;  
         Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;  
         Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;  
         Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;  
         Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;  
         Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;  
         Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;  
         Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;  
         Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;  
         Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;  
         Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;  
         Xaa at position 57 is Asn or Gly;  
         Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;  
         Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;  
         Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;  
         Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;  
         Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;  
         Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;  
         Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;  
         Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;  
         Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;  
         Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;  
         Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;  
         Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;  
         Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;  
         Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;  
         Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;  
         Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;  
         Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;  
         Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;  
         Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;  
         Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;  
         Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;  
         Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;  
         Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;  
         Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;  
         Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;  
         Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;  
         Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;  
         Xaa at position 85 is Leu, Asn, Val, or Gln;  
         Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;  
         Xaa at position 87 is Leu, Ser, Trp, or Gly;  
         Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;  
         Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;  
         Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;  
         Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;  
         Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;  
         Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;  
         Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;  
         Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;  
         Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;  
         Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;  
         Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;  
         Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;  
         Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;  
         Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;  
         Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;  
         Xaa at position 103 is Asp, or Ser;  
         Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;  
         Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;  
         Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;  
         Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;  
         Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;  
         Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;  
         Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;  
         Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;  
         Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;  
         Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;  
         Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;  
         Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;  
         Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;  
         Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;  
         Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;  
         Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;  
         Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;  
         Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;  
         Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;  
         and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus; and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ).  
       
     
     
         11 . A replicatable vector comprising a nucleic acid molecule encoding a human interleukin-3 mutant polypeptide of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                   Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                   [SEQ ID NO:19] 
                     
                 
                    1               5                  10                  15 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 
                 
                                    20                 25                  30 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    35                 40                  45 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    50                 55                  60 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    65                 70                  75 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    80                 85                  90 
                 
                     
                 
                   Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    95                 100                 105 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Gln Gln 
                 
                                   110 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein 
 Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;  
 Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;  
 Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;  
 Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;  
 Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;  
 Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;  
 Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;  
 Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;  
 Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;  
 Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;  
 Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;  
 Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;  
 Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;  
 Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;  
 Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;  
 Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;  
 Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;  
 Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;  
 Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;  
 Xaa at position 22 is Asp, Leu, or Val;  
 Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;  
 Xaa at position 24 is Asn, or Ala;  
 Xaa at position 26 is Leu, Trp, or Arg;  
 Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;  
 Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;  
 Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;  
 Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;  
 Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;  
 Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;  
 Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;  
 Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;  
 Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;  
 Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;  
 Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;  
 Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;  
 Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;  
 Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;  
 Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;  
 Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;  
 Xaa at position 43 is Asn or Gly;  
 Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;  
 Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;  
 Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;  
 Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;  
 Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;  
 Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;  
 Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;  
 Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;  
 Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;  
 Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;  
 Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;  
 Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;  
 Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;  
 Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;  
 Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;  
 Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;  
 Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;  
 Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;  
 Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;  
 Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;  
 Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;  
 Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;  
 Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;  
 Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;  
 Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;  
 Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;  
 Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;  
 Xaa at position 71 is Leu, Asn, Val, or Gln;  
 Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;  
 Xaa at position 73 is Leu, Ser, Trp, or Gly;  
 Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;  
 Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;  
 Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;  
 Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;  
 Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;  
 Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;  
 Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;  
 Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;  
 Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;  
 Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;  
 Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;  
 Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;  
 Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;  
 Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;  
 Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;  
 Xaa at position 89 is Asp, or Ser;  
 Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;  
 Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;  
 Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;  
 Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;  
 Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;  
 Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;  
 Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;  
 Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;  
 Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;  
 Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;  
 Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;  
 Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;  
 Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;  
 Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;  
 Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;  
 Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;  
 Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;  
 Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;  
 Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;  
 and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ).  
 
     
     
         12 . A replicatable vector comprising a nucleic acid molecule encoding a human interleukin-3 mutant polypeptide is of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                          1               5                  10 
                   [SEQ ID NO:129] 
                     
                 
                   (Met) m -Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr 
                 
                     
                 
                               15                 20 
                 
                   Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 
                 
                     
                 
                   25                  30                 35 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                           40                  45             50 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 
                 
                     
                 
                                   55                 60 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                       65                  70              75 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                               80                  85 
                 
                   Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 
                 
                     
                 
                   90                  95                 100 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                           105                110                 115 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                                   120                125 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 
                 
                     
                 
                       130 
                 
                   Ser Leu Ala Ile Phe 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; Xaa at position 18 is Asn or Ile; Xaa at position 19 is Met, Ala or Ile; Xaa at position 20 is Ile, Pro or Leu; Xaa at position 23 is Ile, Ala or Leu; Xaa at position 25 is Thr or His; Xaa at position 29 is Gln, Arg, Val or Ile; Xaa at position 32 is Leu, Ala, Asn or Arg; Xaa at position 34 is Leu or Ser; Xaa at position 37 is Phe, Pro, or Ser; Xaa at position 38 is Asn or Ala; Xaa at position 42 is Gly, Ala, Ser, Asp or Asn; Xaa at position 45 is Gln, Val, or Met; Xaa at position 46 is Asp or Ser; Xaa at position 49 is Met, Ile, Leu or Asp; Xaa at position 50 is Glu or Asp; Xaa at position 51 is Asn Arg or Ser; Xaa at position 55 is Arg, Leu, or Thr; Xaa at position 56 is Pro or Ser; Xaa at position 59 is Glu or Leu; Xaa at position 60 is Ala or Ser; Xaa at position 62 is Asn, Val or Pro; Xaa at position 63 is Arg or His; Xaa at position 65 is Val or Ser; Xaa at position 67 is Ser, Asn, His or Gln; Xaa at position 69 is Gln or Glu; Xaa at position 73 is Ala or Gly; Xaa at position 76 is Ser, Ala or Pro; Xaa at position 79 is Lys, Arg or Ser; Xaa at position 82 is Leu, Glu, Val or Trp; Xaa at position 85 is Leu or Val; Xaa at position 87 is Leu, Ser, Tyr; Xaa at position 88 is Ala or Trp; Xaa at position 91 is Ala or Pro; Xaa at position 93 is Pro or Ser; Xaa at position 95 is His or Thr; Xaa at position 98 is His, Ile, or Thr; Xaa at position 100 is Lys or Arg; Xaa at position 101 is Asp, Ala or Met; Xaa at position 105 is Asn or Glu; Xaa at position 109 is Arg, Glu or Leu; Xaa at position 112 is Thr or Gln; Xaa at position 116 is Lys, Val, Trp or Ser; Xaa at position 117 is Thr or Ser; Xaa at position 120 is Asn, Gln, or His; Xaa at position 123 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         13 . A replicatable vector comprising a nucleic acid molecule encoding a human interleukin-3 mutant polypeptide is of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                                1              5               10 
                   [SEQ ID NO:130] 
                     
                 
                   (Met m -Ala n ) p -Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile 
                 
                     
                 
                                   15                  20 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                        25                 30                 35 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 
                 
                     
                 
                               40                 45 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                   50                  55                 60 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                           65                  70                 75 
                 
                   Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 
                 
                     
                 
                                   80                  85 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                       90                  95                   100 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                               105                110 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; n is 0 or 1; p is 0 or 1; Xaa at position 4 is Asn or Ile; Xaa at position 5 is Met, Ala or Ile: Xaa at position 6 is Ile, Pro or Leu; Xaa at position 9 is Ile, Ala or Leu; Xaa at position 11 is Thr or His; Xaa at position 15 is Gln, Arg, Val or Ile; Xaa at position 18 is Leu, Ala, Asn or Arg; Xaa at position 20 is Leu or Ser; Xaa at position 23 is Phe, Pro, or Ser; Xaa at position 24 is Asn or Ala; Xaa at position 28 is Gly, Ala, Ser, Asp or Asn; Xaa at position 31 is Gln, Val, or Met; Xaa at position 32 is Asp or Ser; Xaa at position 35 is Met, Ile or Asp; Xaa at position 36 is Glu or Asp; Xaa at position 37 is Asn, Arg or Ser; Xaa at position 41 is Arg, Leu, or Thr; Xaa at position 42 is Pro or Ser; Xaa at position 45 is Glu or Leu; Xaa at position 46 is Ala or Ser; Xaa at position 48 is Asn, Val or Pro; Xaa at position 49 is Arg or His; Xaa at position 51 is Val or Ser; Xaa at position 53 is Ser, Asn, His or Gln; Xaa at position 55 is Gln or Glu; Xaa at position 59 is Ala or Gly; Xaa at position 62 is Ser, Ala or Pro; Xaa at position 65 is Lys, Arg or Ser; Xaa at position 67 is Leu, Glu, or Val; Xaa at position 68 is Leu, Glu, Val or Trp; Xaa at position 71 is Leu or Val; Xaa at position 73 is Leu, Ser or Tyr; Xaa at position 74 is Ala or Trp; Xaa at position 77 is Ala or Pro; Xaa at position 79 is Pro or Ser; Xaa at position 81 is His or Thr; Xaa at position 84 is His, Ile, or Thr; Xaa at position 86 is Lys or Arg; Xaa at position 87 is Asp, Ala or Met; Xaa at position 91 is Asn or Glu; Xaa at position 95 is Arg, Glu Leu; Xaa at position 98 Thr or Gln; Xaa at position 102 is Lys, Val, Trp or Ser; Xaa at position 103 is Thr or Ser; Xaa at position 106 is Asn, Gln, or His; Xaa at position 109 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         14 . A host cell comprising the vector of  claim 10 ,  11 ,  12 , or  13 .  
     
     
         15 . A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a human interleukin-3 mutant polypeptide of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                   Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn 
                   [SEQ ID NO:15] 
                     
                 
                    1               5                  10                   15 
                 
                     
                 
                   Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    20                 25                   30 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    35                 40                   45 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    50                 55                   60 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    65                 70                   75 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    80                 85                   90 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    95                 100                 105 
                 
                     
                 
                   Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                   110                 115                 120 
                 
                     
                 
                   Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe 
                 
                                   125                 130 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
         wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;  
         Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;  
         Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;  
         Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;  
         Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;  
         Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;  
         Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;  
         Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;  
         Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;  
         Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;  
         Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;  
         Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;  
         Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;  
         Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;  
         Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;  
         Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;  
         Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;  
         Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;  
         Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;  
         Xaa at position 36 is Asp, Leu, or Val;  
         Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;  
         Xaa at position 38 is Asn, or Ala;  
         Xaa at position 40 is Leu, Trp, or Arg;  
         Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;  
         Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;  
         Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;  
         Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;  
         Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;  
         Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;  
         Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;  
         Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;  
         Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;  
         Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;  
         Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;  
         Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;  
         Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;  
         Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;  
         Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;  
         Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;  
         Xaa at position 57 is Asn or Gly;  
         Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;  
         Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;  
         Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;  
         Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;  
         Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;  
         Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;  
         Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;  
         Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;  
         Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;  
         Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;  
         Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;  
         Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;  
         Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;  
         Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;  
         Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;  
         Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;  
         Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;  
         Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;  
         Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;  
         Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;  
         Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;  
         Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;  
         Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;  
         Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;  
         Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;  
         Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;  
         Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;  
         Xaa at position 85 is Leu, Asn, Val, or Gln;  
         Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;  
         Xaa at position 87 is Leu, Ser, Trp, or Gly;  
         Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;  
         Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;  
         Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;  
         Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;  
         Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;  
         Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;  
         Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;  
         Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;  
         Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;  
         Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;  
         Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;  
         Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;  
         Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;  
         Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;  
         Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;  
         Xaa at position 103 is Asp, or Ser;  
         Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;  
         Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;  
         Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;  
         Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;  
         Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;  
         Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;  
         Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;  
         Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;  
         Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;  
         Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;  
         Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;  
         Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;  
         Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;  
         Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;  
         Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;  
         Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;  
         Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;  
         Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;  
         Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;  
         and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus; and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ).  
       
     
     
         16 . A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a human interleukin-3 mutant polypeptide of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                   Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                   [SEQ ID NO:19] 
                     
                 
                    1               5                  10                   15 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 
                 
                                    20                 25                   30 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    35                 40                   45 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    50                 55                   60 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    65                 70                   75 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    80                 85                   90 
                 
                     
                 
                   Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    95                 100                 105 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Gln Gln 
                 
                                   110 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein 
 Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;  
 Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;  
 Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;  
 Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;  
 Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;  
 Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;  
 Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;  
 Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;  
 Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;  
 Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;  
 Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;  
 Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;  
 Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;  
 Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;  
 Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;  
 Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;  
 Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;  
 Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;  
 Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;  
 Xaa at position 22 is Asp, Leu, or Val;  
 Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;  
 Xaa at position 24 is Asn, or Ala;  
 Xaa at position 26 is Leu, Trp, or Arg;  
 Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;  
 Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;  
 Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;  
 Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;  
 Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;  
 Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;  
 Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;  
 Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;  
 Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;  
 Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;  
 Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;  
 Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;  
 Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;  
 Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;  
 Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;  
 Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;  
 Xaa at position 43 is Asn or Gly;  
 Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;  
 Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;  
 Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;  
 Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;  
 Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;  
 Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;  
 Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;  
 Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;  
 Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;  
 Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;  
 Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;  
 Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;  
 Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;  
 Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;  
 Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;  
 Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;  
 Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;  
 Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;  
 Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;  
 Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;  
 Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;  
 Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;  
 Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;  
 Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;  
 Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;  
 Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;  
 Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;  
 Xaa at position 71 is Leu, Asn, Val, or Gln;  
 Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;  
 Xaa at position 73 is Leu, Ser, Trp, or Gly;  
 Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;  
 Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;  
 Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;  
 Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;  
 Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;  
 Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;  
 Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;  
 Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;  
 Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;  
 Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;  
 Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;  
 Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;  
 Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;  
 Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;  
 Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;  
 Xaa at position 89 is Asp, or Ser;  
 Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;  
 Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;  
 Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;  
 Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;  
 Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;  
 Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;  
 Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;  
 Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;  
 Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;  
 Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;  
 Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;  
 Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;  
 Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;  
 Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;  
 Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;  
 Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;  
 Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;  
 Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;  
 Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;  
 and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ).  
 
     
     
         17 . A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a human interleukin-3 mutant polypeptide is of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                          1               5                 10 
                     
                     
                 
                   (Met) m -Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr 
                   [SEQ ID NO:129] 
                 
                     
                 
                               15                 20 
                 
                   Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 
                 
                     
                 
                   25                  30                 35 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                           40                  45             50 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 
                 
                     
                 
                                   55                 60 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                       65                  70              75 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                               80                  85 
                 
                   Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 
                 
                     
                 
                   90                  95                 100 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                           105                110                 115 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                                   120                125 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 
                 
                     
                 
                       130 
                 
                   Ser Leu Ala Ile Phe 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; Xaa at position 18 is Asn or Ile; Xaa at position 19 is Met, Ala or Ile; Xaa at position 20 is Ile, Pro or Leu; Xaa at position 23 is Ile, Ala or Leu; Xaa at position 25 is Thr or His; Xaa at position 29 is Gln, Arg, Val or Ile; Xaa at position 32 is Leu, Ala, Asn or Arg; Xaa at position 34 is Leu or Ser; Xaa at position 37 is Phe, Pro, or Ser; Xaa at position 38 is Asn or Ala; Xaa at position 42 is Gly, Ala, Ser, Asp or Asn; Xaa at position 45 is Gln, Val, or Met; Xaa at position 46 is Asp or Ser; Xaa at position 49 is Met, Ile, Leu or Asp; Xaa at position 50 is Glu or Asp; Xaa at position 51 is Asn Arg or Ser; Xaa at position 55 is Arg, Leu, or Thr; Xaa at position 56 is Pro or Ser; Xaa at position 59 is Glu or Leu; Xaa at position 60 is Ala or Ser; Xaa at position 62 is Asn, Val or Pro; Xaa at position 63 is Arg or His; Xaa at position 65 is Val or Ser; Xaa at position 67 is Ser, Asn, His or Gln; Xaa at position 69 is Gln or Glu; Xaa at position 73 is Ala or Gly; Xaa at position 76 is Ser, Ala or Pro; Xaa at position 79 is Lys, Arg or Ser; Xaa at position 82 is Leu, Glu, Val or Trp; Xaa at position 85 is Leu or Val; Xaa at position 87 is Leu, Ser, Tyr; Xaa at position 88 is Ala or Trp; Xaa at position 91 is Ala or Pro; Xaa at position 93 is Pro or Ser; Xaa at position 95 is His or Thr; Xaa at position 98 is His, Ile, or Thr; Xaa at position 100 is Lys or Arg; Xaa at position 101 is Asp, Ala or Met; Xaa at position 105 is Asn or Glu; Xaa at position 109 is Arg, Glu or Leu; Xaa at position 112 is Thr or Gln; Xaa at position 116 is Lys, Val, Trp or Ser; Xaa at position 117 is Thr or Ser; Xaa at position 120 is Asn, Gln, or His; Xaa at position 123 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         18 . A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a human interleukin-3 mutant polypeptide is of the Formula:  
       
         
           
                 
                 
                 
               
                     
                 
                                1              5               10 
                     
                     
                 
                   (Met m -Alan) p -Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile 
                   [SEQ ID NO:130] 
                 
                     
                 
                                   15                  20 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                        25                 30                 35 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 
                 
                     
                 
                               40                 45 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                   50                  55                 60 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                           65                  70                 75 
                 
                   Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 
                 
                     
                 
                                   80                  85  
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                       90                  95                   100 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                               105                110 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; n is 0 or 1; p is 0 or 1; Xaa at position 4 is Asn or Ile; Xaa at position 5 is Met, Ala or Ile: Xaa at position 6 is Ile, Pro or Leu; Xaa at position 9 is Ile, Ala or Leu; Xaa at position 11 is Thr or His; Xaa at position 15 is Gln, Arg, Val or Ile; Xaa at position 18 is Leu, Ala, Asn or Arg; Xaa at position 20 is Leu or Ser; Xaa at position 23 is Phe, Pro, or Ser; Xaa at position 24 is Asn or Ala; Xaa at position 28 is Gly, Ala, Ser, Asp or Asn; Xaa at position 31 is Gln, Val, or Met; Xaa at position 32 is Asp or Ser; Xaa at position 35 is Met, Ile or Asp; Xaa at position 36 is Glu or Asp; Xaa at position 37 is Asn, Arg or Ser; Xaa at position 41 is Arg, Leu, or Thr; Xaa at position 42 is Pro or Ser; Xaa at position 45 is Glu or Leu; Xaa at position 46 is Ala or Ser; Xaa at position 48 is Asn, Val or Pro; Xaa at position 49 is Arg or His; Xaa at position 51 is Val or Ser; Xaa at position 53 is Ser, Asn, His or Gln; Xaa at position 55 is Gln or Glu; Xaa at position 59 is Ala or Gly; Xaa at position 62 is Ser, Ala or Pro; Xaa at position 65 is Lys, Arg or Ser; Xaa at position 67 is Leu, Glu, or Val; Xaa at position 68 is Leu, Glu, Val or Trp; Xaa at position 71 is Leu or Val; Xaa at position 73 is Leu, Ser or Tyr; Xaa at position 74 is Ala or Trp; Xaa at position 77 is Ala or Pro; Xaa at position 79 is Pro or Ser; Xaa at position 81 is His or Thr; Xaa at position 84 is His, Ile, or Thr; Xaa at position 86 is Lys or Arg; Xaa at position 87 is Asp, Ala or Met; Xaa at position 91 is Asn or Glu; Xaa at position 95 is Arg, Glu Leu; Xaa at position 98 Thr or Gln; Xaa at position 102 is Lys, Val, Trp or Ser; Xaa at position 103 is Thr or Ser; Xaa at position 106 is Asn, Gln, or His; Xaa at position 109 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         19 . A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a composition comprising a human interleukin-3 mutant polypeptide of the Formula and a pharmaceutically acceptable carrier:  
       
         
           
                 
                 
                 
               
                     
                 
                   Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn 
                   [SEQ ID NO:15] 
                     
                 
                    1               5                  10                  15 
                 
                     
                 
                   Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    20                 25                   30 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    35                 40                   45 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    50                 55                   60 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    65                 70                  75 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    80                 85                  90 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    95                 100                 105 
                 
                     
                 
                   Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                   110                 115                 120 
                 
                     
                 
                   Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe 
                 
                                   125                 130 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
         wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;  
         Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;  
         Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;  
         Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;  
         Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;  
         Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;  
         Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;  
         Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;  
         Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;  
         Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;  
         Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;  
         Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;  
         Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;  
         Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;  
         Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;  
         Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;  
         Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;  
         Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;  
         Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;  
         Xaa at position 36 is Asp, Leu, or Val;  
         Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;  
         Xaa at position 38 is Asn, or Ala;  
         Xaa at position 40 is Leu, Trp, or Arg;  
         Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;  
         Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;  
         Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;  
         Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;  
         Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;  
         Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;  
         Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;  
         Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;  
         Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;  
         Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;  
         Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;  
         Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;  
         Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;  
         Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;  
         Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;  
         Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;  
         Xaa at position 57 is Asn or Gly;  
         Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;  
         Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;  
         Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;  
         Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;  
         Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;  
         Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;  
         Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;  
         Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;  
         Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;  
         Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;  
         Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;  
         Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;  
         Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;  
         Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;  
         Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;  
         Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;  
         Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;  
         Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;  
         Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;  
         Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;  
         Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;  
         Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;  
         Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;  
         Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;  
         Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;  
         Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;  
         Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;  
         Xaa at position 85 is Leu, Asn, Val, or Gln;  
         Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;  
         Xaa at position 87 is Leu, Ser, Trp, or Gly;  
         Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;  
         Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;  
         Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;  
         Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;  
         Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;  
         Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;  
         Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;  
         Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;  
         Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;  
         Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;  
         Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;  
         Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;  
         Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;  
         Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;  
         Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;  
         Xaa at position 103 is Asp, or Ser;  
         Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;  
         Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;  
         Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;  
         Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;  
         Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;  
         Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;  
         Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;  
         Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;  
         Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;  
         Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;  
         Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;  
         Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;  
         Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;  
         Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;  
         Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;  
         Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;  
         Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;  
         Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;  
         Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;  
         and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus; and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ).  
       
     
     
         20 . A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a composition comprising a human interleukin-3 mutant polypeptide of the Formula and a pharmaceutically acceptable carrier:  
       
         
           
                 
                 
                 
               
                     
                 
                   Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                   [SEQ ID NO:19] 
                     
                 
                    1               5                  10                  15 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 
                 
                                        20             25                  30 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    35                 40                  45 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    50                 55                  60 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    65                 70                  75 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    80                 85                  90 
                 
                     
                 
                   Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 
                 
                                    95                 100                 105 
                 
                     
                 
                   Xaa Xaa Xaa Xaa Gln Gln 
                 
                                   110 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein 
 Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;  
 Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;  
 Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;  
 Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;  
 Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;  
 Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;  
 Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;  
 Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;  
 Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;  
 Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;  
 Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;  
 Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;  
 Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;  
 Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;  
 Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;  
 Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;  
 Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;  
 Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;  
 Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;  
 Xaa at position 22 is Asp, Leu, or Val;  
 Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;  
 Xaa at position 24 is Asn, or Ala;  
 Xaa at position 26 is Leu, Trp, or Arg;  
 Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;  
 Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;  
 Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;  
 Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;  
 Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;  
 Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;  
 Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;  
 Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;  
 Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;  
 Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;  
 Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;  
 Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;  
 Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;  
 Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;  
 Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;  
 Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;  
 Xaa at position 43 is Asn or Gly;  
 Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;  
 Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;  
 Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;  
 Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;  
 Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;  
 Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;  
 Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;  
 Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;  
 Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;  
 Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;  
 Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;  
 Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;  
 Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;  
 Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;  
 Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;  
 Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;  
 Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;  
 Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;  
 Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;  
 Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;  
 Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;  
 Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;  
 Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;  
 Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;  
 Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;  
 Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;  
 Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;  
 Xaa at position 71 is Leu, Asn, Val, or Gln;  
 Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;  
 Xaa at position 73 is Leu, Ser, Trp, or Gly;  
 Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;  
 Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;  
 Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;  
 Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;  
 Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;  
 Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;  
 Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;  
 Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;  
 Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;  
 Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;  
 Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;  
 Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;  
 Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;  
 Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;  
 Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;  
 Xaa at position 89 is Asp, or Ser;  
 Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;  
 Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;  
 Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;  
 Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;  
 Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;  
 Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;  
 Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;  
 Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;  
 Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;  
 Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;  
 Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;  
 Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;  
 Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;  
 Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;  
 Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;  
 Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;  
 Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;  
 Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;  
 Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;  
 and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ).  
 
     
     
         21 . A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a composition comprising human interleukin-3 mutant polypeptide is of the Formula and a pharmaceutically acceptable carrier:  
       
         
           
                 
                 
                 
               
                     
                 
                         1                5                  10 
                     
                     
                 
                   (Met) m -Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr 
                   [SEQ ID NO:129] 
                 
                     
                 
                               15                20 
                 
                   Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 
                 
                     
                 
                   25                  30                 35 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                           40                  45             50 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 
                 
                     
                 
                                   55                 60 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                       65                  70              75 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Gln Xaa 
                 
                     
                 
                               80                  85 
                 
                   Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 
                 
                     
                 
                   90                  95                 100 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                           105                110                 115 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                                   120                125 
                 
                   Xaa Xaa Leu Gln Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 
                 
                     
                 
                       130 
                 
                   Ser Leu Ala Ile Phe 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; Xaa at position 18 is Asn or Ile; Xaa at position 19 is Met, Ala or Ile; Xaa at position 20 is Ile, Pro or Leu; Xaa at position 23 is Ile, Ala or Leu; Xaa at position 25 is Thr or His; Xaa at position 29 is Gln, Arg, Val or Ile; Xaa at position 32 is Leu, Ala, Asn or Arg; Xaa at position 34 is Leu or Ser; Xaa at position 37 is Phe, Pro, or Ser; Xaa at position 38 is Asn or Ala; Xaa at position 42 is Gly, Ala, Ser, Asp or Asn; Xaa at position 45 is Gln, Val, or Met; Xaa at position 46 is Asp or Ser; Xaa at position 49 is Met, Ile, Leu or Asp; Xaa at position 50 is Glu or Asp; Xaa at position 51 is Asn Arg or Ser; Xaa at position 55 is Arg, Leu, or Thr; Xaa at position 56 is Pro or Ser; Xaa at position 59 is Glu or Leu; Xaa at position 60 is Ala or Ser; Xaa at position 62 is Asn, Val or Pro; Xaa at position 63 is Arg or His; Xaa at position 65 is Val or Ser; Xaa at position 67 is Ser, Asn, His or Gln; Xaa at position 69 is Gln or Glu; Xaa at position 73 is Ala or Gly; Xaa at position 76 is Ser, Ala or Pro; Xaa at position 79 is Lys, Arg or Ser; Xaa at position 82 is Leu, Glu, Val or Trp; Xaa at position 85 is Leu or Val; Xaa at position 87 is Leu, Ser, Tyr; Xaa at position 88 is Ala or Trp; Xaa at position 91 is Ala or Pro; Xaa at position 93 is Pro or Ser; Xaa at position 95 is His or Thr; Xaa at position 98 is His, Ile, or Thr; Xaa at position 100 is Lys or Arg; Xaa at position 101 is Asp, Ala or Met; Xaa at position 105 is Asn or Glu; Xaa at position 109 is Arg, Glu or Leu; Xaa at position 112 is Thr or Gln; Xaa at position 116 is Lys, Val, Trp or Ser; Xaa at position 117 is Thr or Ser; Xaa at position 120 is Asn, Gln, or His; Xaa at position 123 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         22 . A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a composition comprising human interleukin-3 mutant polypeptide is of the Formula and a pharmaceutically acceptable carrier:  
       
         
           
                 
                 
                 
               
                     
                 
                                1              5               10 
                     
                     
                 
                   (Met m -Alan) p -Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile 
                   [SEQ ID NO:130] 
                 
                     
                 
                                   15                  20 
                 
                   Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 
                 
                     
                 
                        25                 30                 35 
                 
                   Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 
                 
                     
                 
                               40                 45 
                 
                   Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 
                 
                     
                 
                   50                  55                 60 
                 
                   Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 
                 
                     
                 
                           65                  70                 75 
                 
                   Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 
                 
                     
                 
                                   80                  85 
                 
                   Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 
                 
                     
                 
                       90                  95                   100 
                 
                   Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 
                 
                     
                 
                               105                110 
                 
                   Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln 
                 
                     
                 
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       wherein m is 0 or 1; n is 0 or 1; p is 0 or 1; Xaa at position 4 is Asn or Ile; Xaa at position 5 is Met, Ala or Ile: Xaa at position 6 is Ile, Pro or Leu; Xaa at position 9 is Ile, Ala or Leu; Xaa at position 11 is Thr or His; Xaa at position 15 is Gln, Arg, Val or Ile; Xaa at position 18 is Leu, Ala, Asn or Arg; Xaa at position 20 is Leu or Ser; Xaa at position 23 is Phe, Pro, or Ser; Xaa at position 24 is Asn or Ala; Xaa at position 28 is Gly, Ala, Ser, Asp or Asn; Xaa at position 31 is Gln, Val, or Met; Xaa at position 32 is Asp or Ser; Xaa at position 35 is Met, Ile or Asp; Xaa at position 36 is Glu or Asp; Xaa at position 37 is Asn, Arg or Ser; Xaa at position 41 is Arg, Leu, or Thr; Xaa at position 42 is Pro or Ser; Xaa at position 45 is Glu or Leu; Xaa at position 46 is Ala or Ser; Xaa at position 48 is Asn, Val or Pro; Xaa at position 49 is Arg or His; Xaa at position 51 is Val or Ser; Xaa at position 53 is Ser, Asn, His or Gln; Xaa at position 55 is Gln or Glu; Xaa at position 59 is Ala or Gly; Xaa at position 62 is Ser, Ala or Pro; Xaa at position 65 is Lys, Arg or Ser; Xaa at position 67 is Leu, Glu, or Val; Xaa at position 68 is Leu, Glu, Val or Trp; Xaa at position 71 is Leu or Val; Xaa at position 73 is Leu, Ser or Tyr; Xaa at position 74 is Ala or Trp; Xaa at position 77 is Ala or Pro; Xaa at position 79 is Pro or Ser; Xaa at position 81 is His or Thr; Xaa at position 84 is His, Ile, or Thr; Xaa at position 86 is Lys or Arg; Xaa at position 87 is Asp, Ala or Met; Xaa at position 91 is Asn or Glu; Xaa at position 95 is Arg, Glu Leu; Xaa at position 98 Thr or Gln; Xaa at position 102 is Lys, Val, Trp or Ser; Xaa at position 103 is Thr or Ser; Xaa at position 106 is Asn, Gln, or His; Xaa at position 109 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.  
     
     
         23 . A method of treating a patient comprising the steps of: 
 (i) administering to said patient, an amount of a mutant human interleukin-3 (IL-3) polypeptide, effective to promote the proliferation and/or differentiation of hematopoietic cells in said patient, wherein said mutant human interleukin-3 (hIL-3) polypeptide comprises:                              Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn   [SEQ ID NO:15]          1               5                  10                  15           Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      20                 25                  30           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa                      35                 40                  45           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      50                 55                  60           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      65                 70                  75           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      80                 85                  90           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      95                 100                 105           Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      110                115                 120           Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe                     125                 130                                                  wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;    Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;    Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;    Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;    Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;    Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;    Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;    Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;    Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;    Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;    Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;    Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;    Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;    Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;    Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;    Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;    Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;    Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;    Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;    Xaa at position 36 is Asp, Leu, or Val;    Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;    Xaa at position 38 is Asn, or Ala;    Xaa at position 40 is Leu, Trp, or Arg;    Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;    Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;    Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;    Xaa at position 44 is Asp, Ser, Leu, Arq, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;    Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;    Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;    Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;    Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;    Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;    Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;    Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;    Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;    Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;    Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;    Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;    Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;    Xaa at position 57 is Asn or Gly;    Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;    Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;    Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;    Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;    Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;    Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;    Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;    Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;    Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;    Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;    Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;    Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;    Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;    Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;    Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;    Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;    Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;    Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;    Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;    Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;    Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;    Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;    Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;    Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;    Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;    Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;    Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;    Xaa at position 85 is Leu, Asn, Val, or Gln;    Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;    Xaa at position 87 is Leu, Ser, Trp, or Gly;    Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;    Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;    Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;    Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;    Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;    Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;    Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;    Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;    Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;    Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;    Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;    Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;    Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;    Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;    Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;    Xaa at position 103 is Asp, or Ser;    Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;    Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;    Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;    Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;    Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;    Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;    Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;    Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;    Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;    Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;    Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;    Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;    Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;    Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;    Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;    Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;    Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;    Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;    Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;    and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus; and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ); 
 (ii) removing hematopoietic cells from said patient;  
 (iii) administering to said patient cancer radiation therapy or chemotherapy; and  
 (iv) returning said hematopoietic cells to said patient.  
   
     
     
         24 . A method of treating a patient comprising the steps of: 
 (i) administering to said patient, an amount of a mutant human interleukin-3 (IL-3) polypeptide, effective to promote the proliferation and/or differentiation of hematopoietic cells in said patient, wherein said mutant human interleukin-3 (hIL-3) polypeptide comprises:                              Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa   [SEQ ID NO:19]          1               5                  10                  15           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa                      20                 25                  30           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      35                 40                  45           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      50                 55                  60           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      65                 70                  75           Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      80                 85                  90           Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      95                 100                 105           Xaa Xaa Xaa Xaa Gln Gln                     110                                               wherein    Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;    Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;    Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;    Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;    Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;    Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;    Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;    Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;    Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;    Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;    Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;    Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;    Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;    Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;    Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;    Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;    Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;    Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;    Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;    Xaa at position 22 is Asp, Leu, or Val;    Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;    Xaa at position 24 is Asn, or Ala;    Xaa at position 26 is Leu, Trp, or Arg;    Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;    Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;    Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;    Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;    Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;    Xaa at position 32 is Asp, Phe, Ser. Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;    Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;    Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;    Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;    Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;    Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;    Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;    Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;    Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;    Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;    Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;    Xaa at position 43 is Asn or Gly;    Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;    Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;    Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;    Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;    Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;    Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;    Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;    Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;    Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;    Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;    Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;    Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;    Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;    Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;    Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;    Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;    Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;    Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;    Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;    Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;    Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;    Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;    Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;    Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;    Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;    Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;    Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;    Xaa at position 71 is Leu, Asn, Val, or Gln;    Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;    Xaa at position 73 is Leu, Ser, Trp, or Gly;    Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;    Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;    Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;    Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;    Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;    Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;    Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;    Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;    Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;    Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;    Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;    Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;    Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;    Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;    Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;    Xaa at position 89 is Asp, or Ser;    Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;    Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;    Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;    Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;    Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;    Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;    Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;    Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;    Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;    Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;    Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;    Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;    Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;    Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;    Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;    Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;    Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;    Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;    Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;    and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3; and which can additionally be preceded by (methionine −1 ), (alanine −1 ) or (methionine −2 , alanine −1 ); 
 (ii) removing hematopoietic cells from said patient;  
 (iii) administering to said patient cancer radiation therapy or chemotherapy; and  
 (iv) returning said hematopoietic cells to said patient.  
   
     
     
         25 . A method of treating a patient comprising the steps of: 
 (i) administering to said patient, an amount of a mutant human interleukin-3 (IL-3) polypeptide, effective to promote the proliferation and/or differentiation of hematopoietic cells in said patient, wherein said mutant human interleukin-3 (hIL-3) polypeptide comprises:                                     1               5                  10             (Met) m -Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr   [SEQ ID NO:129]                       15                 20     Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile           25                  30                 35     Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa                   40                  45             50     Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu                           55                 60     Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa               65                  70              75     Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa                       80                  85     Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr           90                  95                 100     Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly                   105                110                 115     Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu                           120                125     Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln Thr Thr Leu               130     Ser Leu Ala Ile Phe                                                        wherein m is 0 or 1; Xaa at position 18 is Asn or Ile; Xaa at position 19 is Met, Ala or Ile; Xaa at position 20 is Ile, Pro or Leu; Xaa at position 23 is Ile, Ala or Leu; Xaa at position 25 is Thr or His; Xaa at position 29 is Gln, Arg, Val or Ile; Xaa at position 32 is Leu, Ala, Asn or Arg; Xaa at position 34 is Leu or Ser; Xaa at position 37 is Phe, Pro, or Ser; Xaa at position 38 is Asn or Ala; Xaa at position 42 is Gly, Ala, Ser, Asp or Asn; Xaa at position 45 is Gln, Val, or Met; Xaa at position 46 is Asp or Ser; Xaa at position 49 is Met, Ile, Leu or Asp; Xaa at position 50 is Glu or Asp; Xaa at position 51 is Asn Arg or Ser; Xaa at position 55 is Arg, Leu, or Thr; Xaa at position 56 is Pro or Ser; Xaa at position 59 is Glu or Leu; Xaa at position 60 is Ala or Ser; Xaa at position 62 is Asn, Val or Pro; Xaa at position 63 is Arg or His; Xaa at position 65 is Val or Ser; Xaa at position 67 is Ser, Asn, His or Gln; Xaa at position 69 is Gln or Glu; Xaa at position 73 is Ala or Gly; Xaa at position 76 is Ser, Ala or Pro; Xaa at position 79 is Lys, Arg or Ser; Xaa at position 82 is Leu, Glu, Val or Trp; Xaa at position 85 is Leu or Val; Xaa at position 87 is Leu, Ser, Tyr; Xaa at position 88 is Ala or Trp; Xaa at position 91 is Ala or Pro; Xaa at position 93 is Pro or Ser; Xaa at position 95 is His or Thr; Xaa at position 98 is His, Ile, or Thr; Xaa at position 100 is Lys or Arg; Xaa at position 101 is Asp, Ala or Met; Xaa at position 105 is Asn or Glu; Xaa at position 109 is Arg, Glu or Leu; Xaa at position 112 is Thr or Gln; Xaa at position 116 is Lys, Val, Trp or Ser; Xaa at position 117 is Thr or Ser; Xaa at position 120 is Asn, Gln, or His; Xaa at position 123 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interieukin-3;    (ii) removing hematopoietic cells from said patient;    (iii) administering to said patient cancer radiation therapy or chemotherapy; and    (iv) returning said hematopoietic cells to said patient.    
     
     
         26 . A method of treating a patient comprising the steps of: 
 (i) administering to said patient, an amount of a mutant human interleukin-3 (IL-3) polypeptide, effective to promote the proliferation and/or differentiation of hematopoietic cells in said patient, wherein said mutant human interleukin-3 (hIL-3) polypeptide comprises:                                           1              5               10             (Met m -Ala n ) p -Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile   [SEQ ID NO:130]                           15                  20     Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa                25                 30                 35     Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu                       40                 45     Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa           50                  55                 60     Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa                   65                  70                 75     Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr                           80                  85     Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly               90                  95                   100     Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu                       105                110     Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln                                                  wherein m is 0 or 1; n is 0 or 1; p is 0 or 1; Xaa at position 4 is Asn or Ile; Xaa at position 5 is Met, Ala or Ile: Xaa at position 6 is Ile, Pro or Leu; Xaa at position 9 is Ile, Ala or Leu; Xaa at position 11 is Thr or His; Xaa at position 15 is Gln, Arg, Val or Ile; Xaa at position 18 is Leu, Ala, Asn or Arg; Xaa at position 20 is Leu or Ser; Xaa at position 23 is Phe, Pro, or Ser; Xaa at position 24 is Asn or Ala; Xaa at position 28 is Gly, Ala, Ser, Asp or Asn; Xaa at position 31 is Gln, Val, or Met; Xaa at position 32 is Asp or Ser; Xaa at position 35 is Met, Ile or Asp; Xaa at position 36 is Glu or Asp; Xaa at position 37 is Asn, Arg or Ser; Xaa at position 41 is Arg, Leu, or Thr; Xaa at position 42 is Pro or Ser; Xaa at position 45 is Glu or Leu; Xaa at position 46 is Ala or Ser; Xaa at position 48 is Asn, Val or Pro; Xaa at position 49 is Arg or His; Xaa at position 51 is Val or Ser; Xaa at position 53 is Ser, Asn, His or Gln; Xaa at position 55 is Gln or Glu; Xaa at position 59 is Ala or Gly; Xaa at position 62 is Ser, Ala or Pro; Xaa at position 65 is Lys, Arg or Ser; Xaa at position 67 is Leu, Glu, or Val; Xaa at position 68 is Leu, Glu, Val or Trp; Xaa at position 71 is Leu or Val; Xaa at position 73 is Leu, Ser or Tyr; Xaa at position 74 is Ala or Trp; Xaa at position 77 is Ala or Pro; Xaa at position 79 is Pro or Ser; Xaa at position 81 is His or Thr; Xaa at position 84 is His, Ile, or Thr; Xaa at position 86 is Lys or Arg; Xaa at position 87 is Asp, Ala or Met; Xaa at position 91 is Asn or Glu; Xaa at position 95 is Arg, Glu Leu; Xaa at position 98 Thr or Gln; Xaa at position 102 is Lys, Val, Trp or Ser; Xaa at position 103 is Thr or Ser; Xaa at position 106 is Asn, Gln, or His; Xaa at position 109 is Ala or Glu; with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3;    (ii) removing hematopoietic cells from said patient;    (iii) administering to said patient cancer radiation therapy or chemotherapy; and    (iv) returning said hematopoietic cells to said patient.

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