title: X-chromosome heteromorphism and appearance of meiosis in the rat fetal ovary.
mesh_terms: D000818:Animals; D005260:Female; D005865:Gestational Age; D008540:Meiosis; D009865:Oocytes / Q000166:cytology; D009867:Oogonia / Q000648:ultrastructure; D010053:Ovary / Q000166:cytology / Q000196:embryology*; D051381:Rats; D011919:Rats, Inbred Strains; D012728:Sex Chromatin / Q000648:ultrastructure; D012730:Sex Chromosomes / Q000502:physiology*; D014960:X Chromosome / Q000502:physiology*