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It is a tripeptide with a gamma peptide linkage between the carboxyl group of the glutamate side chain and the amine group of cysteine, and the carboxyl group of cysteine is attached by normal peptide linkage to a glycine

The only difference is how your protein of interest is connected to the agarose beads, which has important implications for how you elute it, and any proteins that it binds to from the column

Neutralizes free radicals such as superoxide and ROS(reactive oxygen species: hydroxy radicals, peroxynitrite, hydroperoxides), Stops free radicals damaging DNA, proteins, and cell membranes

et al (2015) Oncol Lett.