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Reduced glutathione (GSH) is a tripeptide composed of cysteine, glutamic acid and glycine, which plays a key role in the control of signalling processes, detoxification and various other cell processes. Glutathione disulfide (GSSG) is the oxidized form of glutathione. It is reduced to GSH in presence of NADPH by the glutathione reductase (GR). The glutathione peroxidase (GP) converts hydrogen peroxide to water.
