title: Old experiments and new trends in avian sex differentiation.
mesh_terms: D000818:Animals; D001717:Birds / Q000502:physiology*; D002645:Chickens; D004372:Ducks; D004967:Estrogens / Q000502:physiology*; D005260:Female; D008297:Male; D009924:Organ Culture Techniques; D010053:Ovary / Q000196:embryology* / Q000378:metabolism; D011784:Quail; D012733:Sex Differentiation; D013737:Testis / Q000196:embryology* / Q000378:metabolism; D013739:Testosterone / Q000502:physiology*
chemical_list: D004967:Estrogens; D013739:Testosterone