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Ciprofloxacin has no effect on TGF-β1-resistant Caco2 cells. (A) MTT assessed proliferation of Caco-2 cells after treatment with TGF-β1 for 3 days. (B) MTT assessed proliferation of HT-29 and Caco-2 cells after treatment with ciprofloxacin for 6 days (*P < 0.05, **P < 0.01 different from control values). MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenol tetrazolium bromide; TGF, transforming growth factor.
