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Accumulation of intracellular DOX in SGC7901, SGC7901/VCR, SGC7901/VCR/neo and SGC7901/VCR/aPKC cells. Cells were incubated with 4.0 μmol/L DOX for 60 min. Each point represents the mean ± SD from three experiments. bP < 0. 01 vs SGC7901/VCR cells.
