In the process of the spermiogenesis, the antigens were assembled in the cytoplasm other than the acrosomal cap region, which was destined to form the postacrosomal region of the spermatozoon.

• 在精子形成过程中，此抗原由胞质内均匀分布变为聚集于顶体帽旁侧的区域，这一区域将形成顶体后区。