About: http://webisa.webdatacommons.org/197879846

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	A blockage in heme production allows other compounds called porphyrins to build up to toxic levels in the liver and other organs.
http://www.w3.org/ns/prov#wasQuotedFrom	nih.gov