title: The block to sperm penetration in zonal-free mouse eggs.
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002462:Cell Membrane / Q000502:physiology; D005260:Female; D005306:Fertilization; D007700:Kinetics; D008297:Male; D051379:Mice; D010063:Ovum / Q000502:physiology* / Q000648:ultrastructure; D013094:Spermatozoa / Q000502:physiology*; D015044:Zona Pellucida