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Effect of BSO on the cytotoxicity of 5-FU and Dox to Bel7402/5-FU cells. The cells were incubated with different con-centrations of 5-FU (Figure 4A) or Dox (Figure 4B) in the ab-sence (◆) or presence of BSO at the concentration of 5 μmol·L-1 (□), 50 μmol·L-1 (○) and 100 μmol·L-1 (■) respectively for 72 hr. Cell survival was determined by MTT assay. The values represent the means ± SD of three experiments.
