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Tion. However, GSH and GSSG were not measured in the majority of these studies, so the GSH/GSSG redox state cannot be estimated. Although few studies have studied systemic GSH and GSSG in asthma, the few studies that have been conducted do reveal important insight on the systemic GSH/GSSG redox balance of these subjects. In a recent study, plasma GSH concentrations were decreased by nearly 1.5-fol