title: Membrane events in the acrosomal reaction of Limulus and Mytilus sperm.
mesh_terms: D000177:Acrosome / Q000502:physiology / Q000648:ultrastructure*; D000818:Animals; D049872:Bivalvia; D002462:Cell Membrane / Q000648:ultrastructure; D005614:Freeze Fracturing; D006737:Horseshoe Crabs; D008297:Male; D008854:Microscopy, Electron; D013045:Species Specificity; D013094:Spermatozoa / Q000648:ultrastructure*