The CTF consists of two components with molecular weight of 73,000 and 63,000 respectively and there are at least 5 amino acid sequence(Met-Pro-Asp-Lys-Thr) in N-ter-minal of them are homogeneous.

• 两者至少N-端五肽顺序相同(Met-Pro-Asp-Lys-Thr)。