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Viability of MCF-7 cells (A) and MCF-7/ADR cells (B) after treatment with DOX, CA4, DOX+CA4, Pasp-DOX, Pasp-DOX+CA4, PEG-Phis60/DOX/CA4 and PEG-Phis60/Pasp-DOX/CA4 at different concentrations for 48 h. Data are shown as the mean±S.D. of three independent experiments.
