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 Frontiers Research progress of glutathione peroxidase family (GPX) in redoxidation Section 10.3. Oxygen , Cell Function, and Oxidative Stress Study Guide Edubirdie Rapid and effective protocol to measure glutathione peroxidase activity Bulletin of the National Research Centre Springer Nature Link Glutathione Peroxidase 1 in Health and Disease: From Molecular Mechanisms to Therapeutic Opportunities Edith Lubos, Joseph Loscalzo, Diane E. Handy, 2011