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Concentration response curves of the muscarinic agonist, carbachol, on the guinea pig ileum in control (■) or in the presence of (±)-pervilleine A HCl at concentration of 0.1 μM (◊), 10 μM (◆), 30 μM (●) and 100 μM (▲), and in the presence of (-)-hyoscyamine at concentration of 0.1 μM (□) and 10 μM (○). For carbachol control, 9 observations from different experiments were averaged. Vertical lines are SEM. In other observation, n varied from 1 to 3.
