. "\"The chemical reactions and pathways involving glutathione, the tripeptide glutamylcysteinylglycine, which acts as a coenzyme for some enzymes and as an antioxidant in the protection of sulfhydryl groups in enzymes and other proteins; it has a specific role in the reduction of hydrogen peroxide (H2O2) and oxidized ascorbate, and it participates in the gamma-glutamyl cycle.\" [CHEBI:16856, ISBN:0198506732]" . . "glutathione metabolic process" . "glutathione metabolism" . . . . "oxidized glutathione reduction" .