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Glutamic Acid Decarboxylase (GAD) catalyzes the conversion of glutamate to gamma-aminobutyric acid (GABA). There are two known forms of GAD; GAD65 (65 kDa) and GAD67 (67 kDa) that are encoded by two different genes and appear to have distinct intraneuronal distribution in the brain. This antibody reacts with GAD67 and is predicted to react with GAD65.