A common monoamine neurotransmitter in the brain and central nervous system, gastrointestinal tract. It is synthesized from the dietary amino acid l.-tryptophan (see tryptophan hydroxylase), and in the pineal gland it is converted to melatonin.
A common monoamine neurotransmitter in the brain and central nervous system, gastrointestinal tract. It is synthesized from the dietary amino acid l.-tryptophan (see tryptophan hydroxylase), and in the pineal gland it is converted to melatonin.