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An organic compound, C10H12N2O, that is formed from tryptophan and is found especially in the gastrointestinal tract, the platelets, and the nervous system of humans and other animals, and functions as a neurotransmitter and in vasoconstriction, stimulation of the smooth muscles, and regulation of cyclic body processes.
(Biochemistry) a compound that occurs in the brain, intestines, and blood platelets and acts as a neurotransmitter, as well as inducing vasoconstriction and contraction of smooth muscle; 5-hydroxytryptamine (5HT)
[from sero- + ton(ic) + -in]
ser•o•to•nin(ˌsɛr əˈtoʊ nɪn, ˌsɪər-)
an amine, C10H12N20, that occurs esp. in blood and nervous tissue and functions as a vasoconstrictor and neurotransmitter.
A neurotransmitter in the brain, involved in sleep, mood, etc.