Assertion: tryptophan | /r/CapableOf | produce melatonin
Facets:
value: in the brain
type: LOCATION
Source sentences:
text: Tryptophan is an amino acid that produces serotonin, melatonin, and kynurenine.
text: Tryptophan produces melatonin in the brain (pineal gland), the gut, the retina, and immune cells.