Dear all, we are evaluating the cytotoxic effect of plant extracts on HT-29 and HCT116 colon cancer cells. We have determined the IC50 values for each cell line, however, we want also to test those concentrations in the normal colon cells (we are going to use the CCD-33Co cell line) to discard toxic effects on these cells. Which should be the concentrations that we must test in these cells? Some people have suggested us to use up to 3 times the IC50 values but we haven't found documents justifying this. Could you please provide documents or papers indicating suggested concentrations? Thanks in advance for your help.

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