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 Figure 1 from Comparing glutathione peroxidase and glutathione reductase activity and their associations with cardiovascular measures in Africans and Caucasians : the SABPA study Semantic Scholar Frontiers Research progress of glutathione peroxidase family (GPX) in redoxidation Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification Members of Antioxidant Machinery and Their Functions IntechOpen