All of the following are excitatory neurotransmitters except
GABA is the major inhibitory mediator in the brain, including being responsible for presynaptic inhibition. GABA, which exists as b-aminobutyrate in the body fluidsReference: Ganong review of medical physiology 23rd edition Page no; 141
Gamma-aminobutyric acid
Acetylcholine
Dopamine
Serotomin
Nervous system