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Effect of experimental drugs, with or without verapamil, on the sensitivity of parental (MCF-7) and P-gp-expressing (MCF-7/Adr) cells. Cells were incubated in the presence of drug for 24 h, and cell survival was determined by MTT metabolism. Cell survival (mean ± standard deviation) is expressed as a fraction of either untreated or verapamil-treated controls.
