氨基酸序列 Ser-Leu-Arg-Arg-Ser-Ser-C?ys-Phe-Gly-Gly-Arg-Met-As?p-Arg-Ile-Gly-Ala-Gln-Ser?-Gly-Leu-Gly-Cys-Asn-Ser-?Phe-Arg-Tyr [Disulfide bridge: 7-23]
