which of the following neurotransmitters is found in most parts of the brain and is considered inhibitory?
Inhibitory molecules. GABA is a very common neurotransmitter used in IPSPs in the adult mammalian brain and retina. GABA receptors are pentamers most commonly composed of three different subunits (Î±, Î², Î³), although several other subunits (Î´,Îµ, Î¸, Ï, Ï) and conformations exist.