A naturally occurring derivative of the amino acid trytophan that is found in platelets, brain cells, and the gastrointestinal tract. It acts as a potent vasoconstrictor and as a neurotransmitter.
A naturally occurring derivative of the amino acid trytophan that is found in platelets, brain cells, and the gastrointestinal tract. It acts as a potent vasoconstrictor and as a neurotransmitter.