Selection and testing of progestational steroids for oral contraception.
D003267:Contraception; D003270:Contraceptive Agents; D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D009641:Norethynodrel; D011372:Progestins
D003270:Contraceptive Agents; D003276:Contraceptives, Oral; D011372:Progestins; D009641:Norethynodrel
CONTRACEPTIVES, ORAL; NORETHYNODREL; PROGESTATIONAL HORMONES