| 摘要 |
Thrombopoietin polypeptides and vectors, cells, and methods for making the polypeptides are disclosed. The polypeptides are characterized by an amino acid backbone consisting of C-X-B, wherein C is a human thrombopoietin cytokine domain polypeptide; X is a peptide bond or a linker consisting of one or two amino acid residues, subject to the limitation that X, alone or in combination with C or B, does not provide a dibasic amino acid pair; and B is a polypeptide consisting of residues 1 to y of SEQ ID NO:3, wherein y is an integer from 5 to 18, and wherein up to 35 % of the amino acid residues of B are individually replaced by other amino acid residues. The polypeptides are useful with methods of stimulating proliferation or development of hematopoietic cells in vitro and in vivo.
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