PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The drug is a synthetic version of a natural substance called exendin-4, which is obtained from a rather unusual source -- the saliva of the Gila monster lizard (Heloderma suspectum), North America's largest lizard.
http://www.w3.org/ns/prov#wasQuotedFrom
  • sciencedaily.com