assertion  retraction  graph  subject    predicate    object                                                                         datatype    annotation
1          0           graph  DOID:4000  IAO:0000115  An ovarian epithelial cancer that derives_from epithelial transitional cells.  xsd:string  "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007645""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3362466/""}]}"