Characterization and structural analysis of human selenium dependent glutathione peroxidase 4 mutant expressed in Escherichia coli ScienceDirect Longer Lifespans and Better Health with Glutathione: Taking the Confusion Out of the Master Antioxidant WholeFoods Magazine Selenocysteine muscle pain ** **A lack of selenium cause muscle pain mechanism of action.** Selenium exerts its biological functions via molecules called selenoproteins which contain the amino acid cysteine with StructureActivity Correlation between Natural Glutathione Peroxidase (GPx) and Mimics: A Biomimetic Concept for the Design and Synthesis of More Efficient GPx Mimics Mugesh 2001 Chemistry A European Journal Wiley Online Library