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(A) Cell apoptosis levels were evaluated by flow cytometry in HT-29 and HCT116 cells treated with 5-FU for 48 h; *P<0.05. (B) The protein levels of C-PARP and caspase-3 in HT-29 and HCT116 cells treated with 5-FU for 48 h were analyzed by Western blotting; *P<0.05, **P<0.01.
