Mechanics of sperm entry in cycling hamsters.
D000818:Animals; D006224:Cricetinae; D004971:Estrus; D005260:Female; D005306:Fertilization; D008297:Male; D008855:Microscopy, Electron, Scanning; D008871:Microvilli / Q000648:ultrastructure; D010063:Ovum / Q000648:ultrastructure*; D011247:Pregnancy; D013077:Sperm Head / Q000648:ultrastructure; D013082:Sperm Tail / Q000648:ultrastructure; D013094:Spermatozoa / Q000648:ultrastructure*; D013997:Time Factors