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Effect of orange and red grapes extracts, and the 3 relative mixtures (1–25 μg/mL) in combination with DOXO (5 μM) on viability of H9c2 (a,b) and MCF-7 (c,d) cells, evaluated by MTT assay. Data are expressed as mean ± S.E.M. of % of cell viability. ***, ** and * denote respectively p < 0.001, p < 0.01 and p < 0.05 vs DOXO alone. ###, ## and # denote respectively p < 0.001, p < 0.01, and p < 0.05 vs C.
