title: The perinuclear substance of boar, bull ram and rabbit spermatozoa.
mesh_terms: D000177:Acrosome / Q000648:ultrastructure; D000818:Animals; D002417:Cattle; D002467:Cell Nucleus / Q000648:ultrastructure; D006041:Goats; D006651:Histocytochemistry; D008297:Male; D011506:Proteins / Q000032:analysis; D011817:Rabbits; D013077:Sperm Head / Q000032:analysis / Q000648:ultrastructure*; D013087:Spermatids / Q000648:ultrastructure; D013091:Spermatogenesis; D013094:Spermatozoa / Q000648:ultrastructure*; D013552:Swine
chemical_list: D011506:Proteins