title: Ultrastructure of the oocytes of sturgeons at the end of previtellogenesis. I. Ultrastructure of the nucleus.
mesh_terms: D000818:Animals; D002467:Cell Nucleus; D002843:Chromatin; D002875:Chromosomes; D005260:Female; D005399:Fishes / Q000196:embryology*; D008854:Microscopy, Electron; D010063:Ovum / Q000166:cytology*; D013194:Staining and Labeling
chemical_list: D002843:Chromatin