<prompt> All except one are inhibitory neurotransmittersAcetylcholineGlutamateNorepinephrineGlycine  <response>: major inhibitory neurotransmitters include serotoninand gamma-aminobutyric acidGABA. Some neurotransmitters, such as acetylcholine and dopamine, can create both excitatory and inhibitory effects depending upon the type of receptors that are present. 