Assertion: tryptophan | /r/CapableOf | act as precursor
Facets:
value: in the body
type: LOCATION
Source sentences:
text: Once in the body, tryptophan acts as a precursor for important products, including the neurotransmitter serotonin and the hormone melatonin.
text: Buckwheat has all of the essential amino acids, including tryptophan, which acts as a precursor to the feel-good hormone serotonin.