Gamma-aminobutyric acid (usually abbreviated to GABA) with Chemical Formula C₄H₉NO_{2, and Molar mass} 103.12 g/mol is an inhibitory neurotransmitter found in the nervous systems of widely-divergent species. It is the chief inhibitory neurotransmitter in the central nervous system and also in the retina. GABA is an amino acid, but is not found in proteins. Although some GABA can be found in pancreatic islet cells and kidney, there are no significant amounts of GABA in mammalian tissues other than the tissues of the nervous system.. For more info click here.

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