Studies on the nurse cells and oogenesis in the sea urchin ovary. I. Morphology of the nurse cell (light microscopy of epon serial section).
D000818:Animals; D005260:Female; D008867:Microtomy; D009866:Oogenesis; D010053:Ovary / Q000166:cytology; D012617:Sea Urchins / Q000033:anatomy & histology*