title: The biological effects of a new modified sequential oral contraceptive.
mesh_terms: D000328:Adult; D003276:Contraceptives, Oral / Q000494:pharmacology*; D003278:Contraceptives, Oral, Hormonal / Q000494:pharmacology*; D004717:Endometrium / Q000166:cytology; D004958:Estradiol / Q000494:pharmacology; D005260:Female; D006801:Humans; D008234:Lynestrenol / Q000494:pharmacology; D008598:Menstruation; D014556:Urine / Q000032:analysis
chemical_list: D003276:Contraceptives, Oral; D003278:Contraceptives, Oral, Hormonal; D004958:Estradiol; D008234:Lynestrenol