Are human luteinizing granulosa cells a site of action for progesterone and relaxin?**Publication no. 1678 of the Oregon Regional Primate Research Center.††Supported by grants HD 22408 (R.L.S.), HD 18185 and RR 00163 from the National Institutes of Health, Bethesda, Maryland.‡‡Presented at the 36th Annual Meeting of the Society for Gynecologic Investigation, San Diego, California, March 15 to 18, 1989.