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Cells were incubated with a given nucleoside analog with or without co‐incubation with 2.5 μM YC137 for 72 h. The IC50 was determined using the XTT assay. Ara‐C, cytarabine; dFdC, gemcitabine, 2CdA, cladribine. Open bars, HL‐60 cells; closed bars, HL‐60/ara‐C60 cells. Each value represents the mean ± SD of at least three independent experiments. *P ≤ 0.05.
