Nieman, L K The progesterone antagonist RU 486. A potential new contraceptive agent. [electronic resource] - The New England journal of medicine Jan 1987 - 187-91 p. digital Publication Type: Journal Article ISSN: 0028-4793 Standard No.: 10.1056/NEJM198701223160404 doi Subjects--Topical Terms: AdultAnimalsChorionic Gonadotropin--pharmacologyContraceptives, Oral, Synthetic--pharmacologyCorpus Luteum--drug effectsDrug EvaluationEstrenes--pharmacologyFemaleHumansMacaca mulattaMenstruation--drug effectsMifepristoneProgesterone--antagonists & inhibitors