Redox State of Glutathione and Cysteine in Plasma Following Acute Stroke 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 Glutathione Depletion in Mitochondrial Diseases Glutathione Reporter Glutathione in Brain: Overview of Its Conformations, Functions, Biochemical Characteristics, Quantitation and Potential Therapeutic Role in Brain Disorders Neurochemical Research Springer Nature Link