Where GSH represents reduced monomeric glutathione, and GSSG represents oxidized glutathione. Glutathione reductase[?] then reduces the oxidized glutathione to complete the cycle:
Glutathione peroxidase is a tetramer, and the bovine erythrocyte enzyme has a molecular weight of 84,000. It is a selenium containing enzyme with 4 selenocysteine amino acid residues that participate in the actual mechanism of this enzyme.
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