Fertilization.
D000177:Acrosome / Q000502:physiology; D000818:Animals; D005260:Female; D005306:Fertilization; D008297:Male; D008540:Meiosis; D009865:Oocytes / Q000502:physiology; D013081:Sperm Motility; D013084:Sperm-Ovum Interactions; D013090:Spermatocytes / Q000502:physiology; D013094:Spermatozoa / Q000502:physiology