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. 2011 Jul 27;94(3):847–853. doi: 10.3945/ajcn.110.003483

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FIGURE 1. — Mean (±SEM) glutathione (GSH) concentrations (A), GSH fractional synthesis rates (B), and GSH absolute synthesis rates (C) in young control (n = 8) and elderly (n = 8) subjects before and after supplementation with cysteine or glycine. Values are significantly different at P < 0.05 on the basis of 1-factor ANOVA and Bonferroni-corrected t tests. A: ^aSignificantly different from the elderly before supplementation, P < 0.05; ^bnot significantly different from the elderly after supplementation; ^csignificantly different from the elderly before supplementation, P < 0.05. B: ^aSignificantly different from the elderly before supplementation, P < 0.01; ^bnot significantly different from the elderly after supplementation; ^csignificantly different from the elderly after supplementation, P < 0.01. C: ^aSignificantly different from the elderly before supplementation, P < 0.01; ^bnot significantly different from the elderly after supplementation; ^csignificantly different from the elderly after supplementation, P < 0.01. RBC, red blood cells.