<http://webisa.webdatacommons.org/prov/505663302>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/121623305> .
<http://webisa.webdatacommons.org/121623305>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<engagedpatrons.org> .
<http://webisa.webdatacommons.org/121623305>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/121623305>	<http://www.w3.org/ns/prov#value>	"Tryptophan is an amino acid that is the precursor to serotonin, a neurotransmitter that can make you sleepy." .