Effects of inhibin on FPE-induced oocyte maturation. Isolated ovarian follicles were treated with two doses of FPE: 0.025 pit. equiv./ml (A) or 0.25 pit. equiv./ml (B) alone or in the presence of inhibin (50–250 IU/ml) as indicated on the abscissa. Inhibin was added simultaneously or 1 hr previous to FPE addition. Oocyte maturation was monitored by scoring GVBD at 24, 48, and 72 hr of incubation, also indicated on the abscissa. Data are the mean ± SEM from four different experiments. Same letter indicates significantly different from each other at P ≤ 0.05.