title: Initial stages of gonadal development. Theories and methods.
mesh_terms: D000818:Animals; D012734:Disorders of Sex Development; D005260:Female; D005333:Fetus / Q000502:physiology; D006801:Humans; D008297:Male; D008954:Models, Biological; D010053:Ovary / Q000196:embryology*; D011247:Pregnancy; D051381:Rats; D012733:Sex Differentiation; D013737:Testis / Q000196:embryology*