title: Inhibition of placental steroid synthesis by steroid metabolites: possible feedback control.
mesh_terms: D002247:Carbon Isotopes; D003900:Desoxycorticosterone / Q000378:metabolism*; D004964:Estriol / Q000378:metabolism*; D005246:Feedback; D005260:Female; D005333:Fetus / Q000378:metabolism; D006801:Humans; D006913:Hydroxysteroid Dehydrogenases / Q000378:metabolism*; D066298:In Vitro Techniques; D007700:Kinetics; D008431:Maternal-Fetal Exchange; D009243:NAD / Q000378:metabolism; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000378:metabolism; D010920:Placenta / Q000378:metabolism*; D011247:Pregnancy; D011284:Pregnenolone / Q000378:metabolism*; D011374:Progesterone / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes; D009243:NAD; D003900:Desoxycorticosterone; D011374:Progesterone; D011284:Pregnenolone; D010088:Oxidoreductases; D006913:Hydroxysteroid Dehydrogenases; D004964:Estriol