Figure 1 from Depletion of Glutathione during Oxidative Stress and Efficacy of N Acetyl Cysteine: An Old Drug with New Approaches Semantic Scholar Glutathione reductase Wikipedia Ascorbate Glutathione Cycle and Biotic Stress Tolerance in Plants Springer Nature Link TJ. Glutathione peroxidase is an important enzyme in cellular antioxidant defense systems, detoxifying peroxides and hydroperoxides. As a component of the glutathione cycle, it protects the liver from reactive oxygen metabolites. Selenocysteine