title: Patterns in metazoan fertilization.
mesh_terms: D000177:Acrosome / Q000502:physiology; D000818:Animals; D005260:Female; D005306:Fertilization; D008297:Male; D013077:Sperm Head / Q000502:physiology; D013084:Sperm-Ovum Interactions; D013094:Spermatozoa / Q000502:physiology* / Q000648:ultrastructure