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Effect of increasing concentrations of acetylcholine (ACh) on contraction of isolated guinea pigs ileum in absence and presence of atropine . n=7.
*: Comparison of Ach with the control, *p<0.05, **p<0.01, ***p<0.001
+: Comparison of Ach+Atr with the control, +p<0.05, ++p<0.01, +++ p<0.001.
