title: Pharmacokinetic and "potency" of contraceptive steroids.
mesh_terms: D003276:Contraceptives, Oral / Q000378:metabolism* / Q000494:pharmacology; D003277:Contraceptives, Oral, Combined / Q000378:metabolism; D005260:Female; D006801:Humans; D007700:Kinetics; D016912:Levonorgestrel; D009640:Norethindrone / Q000378:metabolism; D009644:Norgestrel / Q000378:metabolism
chemical_list: D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D009644:Norgestrel; D016912:Levonorgestrel; D009640:Norethindrone