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<http://webisa.webdatacommons.org/prov/505663302>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/191065965> .
<http://webisa.webdatacommons.org/191065965>	<http://www.w3.org/ns/prov#value>	"Tryptophan is an amino acid, one of the building blocks of protein, and is available only by prescription in Canada." .
<http://webisa.webdatacommons.org/191065965>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<alive.com> .