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A neurotransmitter is an organic chemical that transmits nerve and brain impulses across the synapses that separate nerve cells and neurons. The well understood neurotransmitters are glutamate, aspartate, D-serine, gamma-Aminobutyric acid (GABA), glycine, dopamine, norepinephrine, adrenaline, histamine, serotonin, acetycholine, adenosine, anandamide and nitric oxide.