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Cytotoxicity of Adriamycin on drug-resistant K562/ADR and drug-free K562/ADR leukemia cell lines by MTT assay. Cells were treated with Adriamycin drug (0–10 μM) for 48 h. and the cytotoxicity was measured by the MTT assay. Data represent as mean±SEM of three independent experiments; ⁎p<0.05 when compared to drug-free K562/ADR cell.
