First, gamma-glutamylcysteine is synthesized from glutamate and cysteine by the enzyme GCL (glutamate cysteine ligase). This first step is what uses up the cysteine in your body. Next, the amino acid glycine is attached to the gamma-glutamylcysteine by the enzyme glutathione synthetase. Glutathione is not produced by the standard method of cellular protein synthesis because the …
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