H-Arg-Asp-Cys-Cys-Thr-Hyp-Hyp-Arg-Lys-Cys-Lys-Asp-Arg-Arg-Cys-Lys-Hyp-Met-Lys-Cys-Cys-Ala-NH2 (Disulfide bonds between Cys³ and Cys¹⁵/Cys⁴ and Cys²⁰/Cys¹⁰ and Cys²¹)