A photographic analysis of protoplasmic movement during cleavage in the sea urchin egg.
D000818:Animals; D002455:Cell Division; D003595:Cytoplasmic Streaming; D005260:Female; D008938:Mitosis; D009040:Motion Pictures; D010063:Ovum; D012617:Sea Urchins / Q000196:embryology*; D013997:Time Factors