Human multi‐drug‐resistant cancer cells exhibit a high degree of selectivity for stereoisomers of verapamil and quinidine

An in vitro cell proliferation assay was developed to measure the capacity of substances to overcome multi‐drug resistance (MDR). The assay is a modification of the MTT (3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide) method. The inclusion of cell titration curves for each concentratio...

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