GABA

gamma-Aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the adult mammalian central nervous system (however ultimately receptors and reversal potentials determine excitatory/inhibitory nature).

Description
GABA binds to two types of receptors:
 * GABAAR's, which are chloride-fluxing ionotropic
 * GABABR's, which are metabotropic G protein-coupled receptors

GABA is synthesized from glutamate via the enzyme glutamate decarboxylase (GAD).