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Dose–response curve of cytotoxicity of pyoktanin (PB) and three anticancer drugs (DXR, 5-FU and melphalan). Cells were incubated for 48 h with the indicated concentrations of test compounds. Experiments were repeated three times. Each value in each panel represents mean ± S.D. of triplicate assays. PB, pyoktanin blue; DXR, doxorubicin; 5-FU, fluorouracil.
