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Effect of fisetin on viability of HCT116 and HT29 colon cancer cells. (A) The structure of fisetin is shown. Thiazolyl blue tetrazolium bromide assays of HCT116 (B) and HT29 (C) colon cancer cells. Cells were treated with fisetin up to 240 μM for 24, 48, 72 and 96 h. The absorbance was measured at 570 nm. All samples were done in triplicate and the data are presented as mean ± SEM. (D) The median inhibition concentration (IC50) values of fisetin for both cell lines are shown.
