title: Penetration in vitro of zona-free hamster eggs by ejaculated boar spermatozoa.
mesh_terms: D000818:Animals; D006224:Cricetinae; D005260:Female; D005306:Fertilization; D066298:In Vitro Techniques; D008297:Male; D010063:Ovum / Q000502:physiology*; D013094:Spermatozoa / Q000502:physiology*; D013552:Swine; D015044:Zona Pellucida