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Inhibition of nizatidine (0.25 mM) transport in the secretory (BL–AP) direction by various verapamil concentrations (0.0001–5 mM). Data presented as a percentage of the uninhibited control. Each data point represents the mean ± SD of studies across three transwells (n = 3). The IC50 value for verapamil on nizatidine transport was estimated by a nonlinear regression using GraphPad Prism 4.01
