<prompt> Glutathione is composed of:GlycineCycteineGlutamateAll of the above  <response>: Ans. d All of the aboveRef: Harpers Biochemistry 30th ed. pg. 22-23, 748 Glutathione GSH is a tripeptide with a gamma peptide linkage between the amine group of cysteine which is attached by normal peptide linkage to a glycine and the carboxyl group of the glutamate side chain. It is an antioxidant, preventing damage to important cellular components caused by reactive oxygen species such as free radicals and peroxides. 