Effect of Hyperprolactinemia on Pituitary Sensitivity to Luteinizing Hormone-Releasing Hormone Following Manipulation of Sex Steroids*†*Supported in part by Research Grant HD-10795-01 from the National Institute of Child Health and Human Development, National Institutes of Health, United States Public Health Service, Bethesda, Md., and in part by the World Health Organization.†Presented at the Thirty-Sixth Annual Meeting of The American Fertility Society, March 18 to 22, 1980, Houston, Tex.