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Effect of theaflavin (TF) on the cloning ability of CNE2 cells detected by a cell colony formation test. (A) Colonies were formed by CNE2 cells after treatment with TF at different concentrations (20, 40, or 80 μM). (B) Data are presented as the mean ± SD from three independent experiments. *P<0.05 and **P<0.01, compared with the control group
