<http://webisa.webdatacommons.org/prov/478548045>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/2028267> .
<http://webisa.webdatacommons.org/2028267>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/2028267>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<nih.gov> .
<http://webisa.webdatacommons.org/2028267>	<http://www.w3.org/ns/prov#value>	"Porphyria can also be caused by environmental factors such as infections or exposures to certain prescription drugs." .
<http://webisa.webdatacommons.org/prov/133336461>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/2028267> .