title: Penetration of guinea-pig spermatozoa into hamster eggs in vitro.
mesh_terms: D000818:Animals; D006224:Cricetinae; D005260:Female; D005306:Fertilization; D006168:Guinea Pigs; D006824:Hybridization, Genetic; D066298:In Vitro Techniques; D008297:Male; D008858:Microscopy, Phase-Contrast; D010063:Ovum / Q000502:physiology*; D013045:Species Specificity; D013094:Spermatozoa / Q000502:physiology*