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Inhibition ratios of FU20, LFU20, free floxuridine, T20 and LT20 to HeLa cells. Samples were diluted with DMEM culture medium (10% FBS) to the corresponding concentration, followed by addition to 96-well plates. Cells were cultured for an additional 48 hours prior to cell viability assay. *Note that the concentration of free floxuridine is twenty-fold over that of the label on the X axis.
