γ-Aminobutyric acid (GABA) is the chief inhibitory in the . It plays an important role in regulating excitability throughout the . In humans, GABA is also directly responsible for the regulation of . In species GABA acts only on excitatory nerve receptors.
Although chemically it is an , GABA is rarely referred to as such in the scientific or medical communities, because the term "amino acid," used without a , refers to the , which GABA is not, nor is it incorporated into .
In in humans, GABA absorption by some nerves becomes impaired, which leads to of the muscles signaled by those nerves.
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