Selenium in biology
Use of Selenium by organisms / From Wikipedia, the free encyclopedia
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Selenium is an essential micronutrient for animals, though it is toxic in large doses. In plants, it sometimes occurs in toxic amounts as forage, e.g. locoweed. Selenium is a component of the amino acids selenocysteine and selenomethionine. In humans, selenium is a trace element nutrient that functions as cofactor for glutathione peroxidases and certain forms of thioredoxin reductase.[1] Selenium-containing proteins are produced from inorganic selenium via the intermediacy of selenophosphate (PSeO33−).