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Recently we reported that an oocyte activation ability in human and mouse sperm is associated with head flatness or the presence of perinuclear theca (PT) substance, MN13, which is an oocyte activation-related protein localized on the post-acrosomal sheath (PAS). As such, we hypothesize that the appearance of oocyte activation ability is stage-specifically regulated and depends on the formation of the acrosome or PAS/PT in spermatids.

Appearance of an oocyte activation-related substance during spermatogenesis in mice and humans