the pentapeptide active site of thymopoietin ( residues 32-36 ) is constant between the human and bovine thymopoietins , but position 34 in the active site of splenin has changed from glutamic acid in bovine splenin to alanine in human splenin , accounting for the biological activity of the human but not the bovine splenin on the human t-cell line molt-4 .
C0080225
pentapeptide
C0040105
thymopoietins