title: The sperm penetration assay: its usefulness reevaluated.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002582:Cervix Mucus; D006224:Cricetinae; D004530:Egg Yolk; D005188:False Negative Reactions; D005189:False Positive Reactions; D005260:Female; D005615:Freezing; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007246:Infertility / Q000175:diagnosis; D008297:Male; D008722:Methods; D051379:Mice; D012661:Semen / Q000032:analysis; D013048:Specimen Handling; D013076:Sperm Count; D013081:Sperm Motility; D013084:Sperm-Ovum Interactions; D013997:Time Factors