This term is obsolete.
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Definition:
OBSOLETE. The chemical reactions and pathways involving neurotransmitters, any of a group of substances that are released on excitation from the axon terminal of a presynaptic neuron of the central or peripheral nervous system and travel across the synaptic cleft to either excite or inhibit the target cell.
Comment:
The reason for obsoletion is that 'neurotransmitter' is unnecessary grouping in the metabolism branch of the ontology, and it creates true path violations.