<prompt> GABA Gamma amino butyric acid is characteristic ofPost-synaptic excitatory transmitterPost-synaptic inhibitory transmitterActivator of glia-cell functionInhibitor of glia cell function  <response>: Functions of GABA:- One of the major inhibitory neurotransmitters in brain. Regulates the activity of neurons by discouraging the transmission signals It is believed that GABA opens chloride channels the permeability of post-synaptic membranes. GABA levels will cause excitation in brain leading to convulsions 