Evidence against the involvement of opiate neurons in mediating the effect of clomiphene citrate on gonadotropin-releasing hormone neurons*†‡*Presented in part at the Twenty-Eighth Annual Meeting of the. Endocrine Society of Australia, August 26 to 28, 1985, Adelaide, Australia.†Supported in part by the National Health and Medical Research Council of Australia.‡Part of this material formed the basis of a fourth-year medical student elective (J. A.).