title: Ultrastructure of the equatorial segment of hamster spermatozoa during penetration of oocytes.
mesh_terms: D000177:Acrosome / Q000502:physiology / Q000648:ultrastructure*; D000818:Animals; D006224:Cricetinae; D005260:Female; D005306:Fertilization; D008297:Male; D009865:Oocytes / Q000502:physiology* / Q000648:ultrastructure; D010063:Ovum / Q000502:physiology*; D013084:Sperm-Ovum Interactions; D013094:Spermatozoa / Q000502:physiology / Q000648:ultrastructure*; D014817:Vitelline Membrane / Q000648:ultrastructure