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General mechanisms of reversible protein S-glutathionylation. Free thiols on reactive cysteinyl residues can be modified after the formation of an intermediate thiol derivative, or more rarely undergo direct thiol-disulfide exchange. S-glutathionylation can be reversed by the action of thiol-modifying enzymes, e.g., glutaredoxin (Grx). Cys = cysteine, GSH = glutathione.
