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Effects of various concentrations of (A) paclitaxel, (B) capecitabine and (C) doxorubicin on the viability of MDA-MB-231 cells 48 h post-treatment. Cell viability was evaluated via the MTT assay. The data are presented as the means ± SEMs of six independent experiments; * = P < 0.05 and ** = P < 0.01 indicate significant cytotoxic effects.
