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Neurotransmitters are chemical substances, synthesized and released by nerve cells, or glandular hormones that excite or inhibit other nerve, muscle, or gland cells. Known neurotransmitters include acetylcholine, aspartic acid, catecholamines, cholecystokinin, endorphins, gamma aminobutyric acid, glutamic acid, glycine, histamine, neurotensin, serotonin, and substance P.


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