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Evaluation of NO level and activities of the antioxidant enzymes. The effects of TPs on the cellular concentrations of (A) NO and (B) MDA. The effects of TPs on the activities of (C) SOD, (D) CAT and (E) GSH-Px. The results are expressed as the mean ± SD of three independent experiments. *P<0.05 and **P<0.01 vs. the control group, #P<0.05 and ##P<0.01 vs. the H2O2 group. NO, nitric oxide; TPs, tea polyphenols; SOD, superoxide dismutase; CAT, catalase; GSH-Px, glutathione peroxidase.
