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The cytotoxic effect of quercetin, imperatorin (A, B) and combined treatment with both drugs (C, D) on viability of HeLa (A, C) and Hep-2 (B, D) cells. C control, Q quercetin, I imperatorin, Q + I cells pre-incubated with quercetin followed by imperatorin administration, I + Q cells pre-incubated with imperatorin followed by quercetin administration, QI cells treated with both drugs administered simultaneously; *p < 0.05
