title: A thin section and freeze-fracture study on membrane specializations in spermatozoa of the isopod, Armadillidium vulgare.
mesh_terms: D000177:Acrosome / Q000648:ultrastructure; D000818:Animals; D002462:Cell Membrane / Q000502:physiology / Q000648:ultrastructure; D003445:Crustacea / Q000502:physiology / Q000648:ultrastructure*; D005614:Freeze Fracturing; D008297:Male; D013094:Spermatozoa / Q000502:physiology / Q000648:ultrastructure*