Inhibitory neurotransmitter in the mammalian brain
GABA
GABA, also known as gamma-aminobutyric acid or γ-aminobutyric acid, is the chief inhibitory neurotransmitter in the developmentally mature mammalian central nervous system.
Its principal role is reducing neuronal excitability throughout the nervous system.
Text adapted from Wikipedia, CC BY-SA 4.0. Photograph: Steffen Prößdorf (see Commons), Wikimedia Commons.