Surface of the equatorial segment of the mammalian acrosome.
D000177:Acrosome / Q000648:ultrastructure*; D000818:Animals; D002417:Cattle; D002462:Cell Membrane / Q000648:ultrastructure; D006224:Cricetinae; D005614:Freeze Fracturing; D006168:Guinea Pigs; D000882:Haplorhini; D008297:Male; D051379:Mice; D011817:Rabbits; D051381:Rats; D013045:Species Specificity; D013094:Spermatozoa / Q000648:ultrastructure*