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A: treatment with P4 in vivo decreased the levels of PGF2α (*P < 0.001 by ANOVA) and was blocked by pretreatment with RU-486 (RU) (#P < 0.001 by ANOVA, mg/kg body wt). B: P4 increased the levels of PGE2 (**P < 0.01 by ANOVA) and was blocked by pretreatment with RU-486 (##P < 0.01 by ANOVA). Values are means ± SE of n = 4.
