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Proliferative activity of the 5-FU-treated SW620 cells at 5-FU concentrations of 6.25, 12.5, 25, 50, 100, 200 and 400 μM, assessed after 24 h using an MTT assay. The y-axis represents the cell survival, calculated as the ratio between the 5-FU-treated and control cells. 5-FU, 5-fluorouracil.
