assertion  retraction  graph  subject    predicate    object                                                                                                                                    datatype    annotation
1          0           graph  DOID:2151  IAO:0000115  An ovary epithelial cancer that has_material_basis_in epithelial and stromal tissue and arises from the surface epithelium of the ovary.  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.sciencedirect.com/science/article/pii/0046817791902054""}]}"