A daily rhythm in hCG binding to ovarian follicles of the cyclic hamster

Summary On each day of the estrous cycle hCG binding to follicle increased from 09.00 to 21.00 h; then hCG binding was static until 09.00 h of the next day. FSH binding did not exhibit rhythmicity. This pattern of hCG binding may be related to the pulsing of LH on each cycle day.Acknowledgments. This work was supported by grants from NICHD (15 526, KO478) to P.F.T. and Center grant to the Kansas Center of Mental Retardation and Human Development (HD 02528). A. K. was supported in part by the Council for International Exchange of Scholars (Fulbright Foundation).