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While it has been known for decades that the essential function of selenium was in the form of??its??incorporation as selenocysteine into selenoproteins-including the enzyme glutathione peroxidase-4-now, Ingold et??al. (2018) reveal the precise role of selenolate-based catalysis by this enzyme.

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Life is a continuous balance between what needs to remain, and what must disappear. We are not aware of it but our bodies unceasingly shed cells that have received orders to die, which is a necessary process if tissues are to be renewed or to stay healthy....