PGF2α (A) and PGFM (B) levels in monkey follicular fluid. Follicular fluid was obtained from monkeys experiencing controlled ovarian stimulation before (0 hour) and 12, 24, and 36 hours after administration of an ovulatory dose of hCG. PG levels were determined by EIA. Within each panel, groups with different superscripts are different by ANOVA and Newman Keuls test, p<0.05. Data are presented as mean±SEM, n=5-6/group.