GEOMETRICAL RELATIONS OF THE CLEAVAGE STIMULUS IN CONSTRICTED SAND DOLLAR EGGS.
D000818:Animals; D002455:Cell Division; D004447:Echinodermata; D004626:Embryology; D005306:Fertilization; D008297:Male; D010063:Ovum; D012106:Research; D012617:Sea Urchins; D013094:Spermatozoa
CELL DIVISION; ECHINODERMATA; EMBRYOLOGY; EXPERIMENTAL LAB STUDY; FERTILIZATION; OVUM; SPERMATOZOA