title: Electron microscopic observations on the oogenesis in sea urchin stained with phosphotungstic acid.
mesh_terms: D004447:Echinodermata / Q000166:cytology*; D005260:Female; D008854:Microscopy, Electron; D010063:Ovum / Q000166:cytology*; D010772:Phosphotungstic Acid; D013194:Staining and Labeling
chemical_list: D010772:Phosphotungstic Acid