Determination of Reduced and Total Glutathione Content in Extremophilic Microalga Galdieria phlegrea Dynamic Performance GHK Cu 50mg Peptide Peak Body Biological Databases and Tools Glutathione Metabolism in A. tumefaciens C58 Cereon Protein Lounge The ascorbateglutathione cycle coming of age Figure 1 from Glutathione redox cycle protects cultured endothelial cells against lysis by extracellularly generated hydrogen peroxide. Semantic Scholar 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