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Neurotransmitter
Pronunciation
Definition 1
A chemical that is made by nerve cells and used to communicate with other cells, including other nerve cells and muscle cells. (NCI Dictionary)
Definition 2
Endogenous signaling molecules that alter the behavior of neurons or effector cells. Neurotransmitter is used here in its most general sense, including not only messengers that act directly to regulate ion channels, but also those that act through second messenger systems, and those that act at a distance from their site of release. Included are neuromodulators, neuroregulators, neuromediators, and neurohumors, whether or not acting at synapses. (NCI Thesaurus)
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