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Glutathione (L-gamma-glutamyl-L-cysteinyl-glycine) is a tripeptide

Glutathione (L-gamma-glutamyl-L-cysteinyl-glycine) is a tripeptide, comprised of glutamyl (green), cysteinyl (black), and glycine (blue) moieties. Image by (Jü 2016). (Courtesy of Wikimedia Commons. Creative Commons Attribution-Share Alike 4.0 International license.)