Absence of fast block to polyspermy in eggs of sea urchin Strongylocentrotus purpuratus.
D000818:Animals; D005260:Female; D005306:Fertilization; D008297:Male; D010063:Ovum / Q000502:physiology*; D012617:Sea Urchins; D013084:Sperm-Ovum Interactions; D013094:Spermatozoa / Q000502:physiology; D013997:Time Factors