title: Studies on the nurse cells and oogenesis in the sea urchin ovary. II. Morphology of the nurse cell (TEM and SEM observations).
mesh_terms: D000818:Animals; D005260:Female; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D009866:Oogenesis; D010053:Ovary / Q000648:ultrastructure; D012617:Sea Urchins / Q000033:anatomy & histology*