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The plasma GSH, MDA, and MPO concentration in young, middle-aged, and old rats after 24 h reperfusion. Sham indicates sham group and I/R indicates I/R group. Young indicates young rats, middle middle age rats, and old old rats. n = 12 per group. Data expressed as mean ± SEM. **P < 0.01 vs. young group. #P < 0.05, ##P < 0.01 vs. middle-aged group
