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特許 権利維持 γ-Aminobutyric acid (/ˈɡæmə əˈmiːnoʊbjuːˈtɪrɨk ˈæsɨd/; or GABA /ˈɡæbə/) is the chief inhibitory neurotransmitter in the mammalian central nervous system. It plays a role in regulating neuronal excitability throughout the nervous system. In humans, GABA is also directly responsible for the regulation of muscle tone.