Glutathione

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Glutathione is a tripeptide. It has many uses such as being an antioxidant and as a sulfydryl buffer. It consists of a glutamate residue, cysteine residue, and a glycine residue. These are bonded to the central cysteine residue by an isopeptide bond from the glutamate's carboxylate side chain and the central cysteine's amino group [1].

References 

  1. Berg, J. Stryer, L. Tymoczko, J. (2011) Biochemistry, 7th Edition, New York: W.H Freeman and Company. Chapter 24, Page 751