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Effects of EGCG on the apoptosis of human thyroid carcinoma cells. a The apoptotic levels of TT, TPC-1, and ARO cells were measured by TUNEL staining; original magnification ×100. b The apoptotic index was calculated by the formula: the apoptotic index = (positively stained apoptotic cells)/(total number of cells) × 100%. Data are presented as mean ± SEM of three independent experiments. *P < 0.05, **P < 0.01 compared with the control group
