Accelerated dissolution of luteal-endometrial integrity by the administration of antagonists of gonadotropin-releasing hormone and progesterone to late-luteal phase women**Supported by Roussel-Uclaf, Romainville, France; by Andrew W. Mellon Foundation, New York, New York; by grant HD-13527 from the National Health and Medical Research Council of Australia, Melbourne, Australia; and in part by grant M01-00827 from the General Clinical Research Branch, National Institutes of Health, Bethesda, Maryland. The research was conducted in part by Clayton Foundation for Research, California Division, La Jolla, California. ††Presented in part at the 37th Annual Meeting of the Society for Gynecologic Investigation, St. Louis, Missouri, March 21 to 24, 1990.