Involved in fertilization ability of sperm.
Subcellular locations: Cytoplasmic vesicle, Secretory vesicle, Acrosome
Small proacrosomal granules (during the Golgi phase), enlarged acrosomal vesicles (during the cap phase), acrosome (during the elongating phase), equatorial segment of the acrosome (during the maturation phase) (By similarity). After acrosome reaction localizes to the equatorial segment region in both noncapacitated and capacitated, acrosome-reacted sperm (By similarity).