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A: P4 blocked the contraction (Δ MI) of ACh (10−6 M) and PGF2α (10−6 M) (*P < 0.001, **P < 0.005 by ANOVA). B: in contrast, P4 increased the percent inhibition of contraction induced by PGE2 (10−6 M) (#P < 0.05 by ANOVA). C: there were no differences in the percent inhibition of contraction of muscle cells induced by 8-bromo c′AMP (8B-cAMP) between P4- and saline-treated muscle cells. Values are means ± SE of n = 3.
