murine p-cell-stimulating factor ( psf ) , murine and human interleukin 2 ( il-2 ) , murine and human granulocyte-macrophage colony-stimulating factor ( gm-csf ) , human erythropoietin , and human interleukin 1 beta all share alanine as the n-terminal amino acid and have some similarities in the succeeding three or four amino acids .
C0021756
interleukin 2
C0086418
human