se·ro·to·nin ( P ) Pronunciation Key (sr-tnn, sîr-)
n.
An organic compound, C10H12N2O, formed from tryptophan and found in animal and human tissue, especially the brain, blood serum, and gastric mucous membranes, and active as a neurotransmitter and in vasoconstriction, stimulation of the smooth muscles, and regulation of cyclic body processes.
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