A: Line plots showing effects of genistein (Gen, 40 μmol/L), resveratrol (Res, 40 μmol/L) and 17β-estradiol (Est, 40 μmol/L) on ACh concentration-dependent contraction curves in isolated guinea pig gallbladder muscle strips (n = 6-7); B: Effects of genistein (Gen, 40 μmol/L), resveratrol (Res, 40 μmol/L) and 17β-estradiol (Est, 40 μmol/L) on KCl concentration-dependent contraction curves in isolated guinea pig gallbladder muscle strips (n = 12).