All except one are inhibitory neurotransmitters
major inhibitory neurotransmitters include serotoninand gamma-aminobutyric acid(GABA). Some neurotransmitters, such as acetylcholine and dopamine, can create both excitatory and inhibitory effects depending upon the type of receptors that are present.
Acetylcholine
Glutamate
Norepinephrine
Glycine
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