title: Gonadal ultrastructure and steroids in foetal zebra.
mesh_terms: D000818:Animals; D005260:Female; D006066:Gonads / Q000196:embryology*; D008297:Male; D008854:Microscopy, Electron; D010053:Ovary / Q000196:embryology; D010527:Perissodactyla; D013256:Steroids / Q000032:analysis*; D013737:Testis / Q000196:embryology
chemical_list: D013256:Steroids