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Spermatozoon acrosomal organization. The spermatozoon has three fundamental pieces: tail, middle, and head. The sperm head has a prominent and compact nucleus, surrounded by a thin cytoplasm that contains nuclear vesicles. The PT is a thin protein layer underneath the acrosomal membrane and is divided into a subacrosomal region, equatorial segment, and PAS-PT. The PAS-PT contains SOAF and is the first to be exposed in the ooplasm during fertilization
