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 Novel role and mechanism of glutathione peroxidase 4 in nutritional pancreatic atrophy of chicks induced by dietary selenium deficiency ScienceDirect Glutathione Peroxidase: An Antioxidant Enzyme In Health And Disease Role of Selenium Dependent Glutathione Peroxidases (Seleno GPxs) in Radio Modulation: Lessons for Radiation Oncology Biological Trace Element Research Springer Nature Link The Selenoprotein Glutathione Peroxidase 4: From Molecular Mechanisms to Novel Therapeutic Opportunities