assertion  retraction  graph  subject    predicate    object                                                                                                   datatype    annotation
1          0           graph  DOID:1294  IAO:0000115  A vulva cancer that has_material_basis_in abnormally proliferating cells derives_from epithelial cells.  xsd:string  "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007637""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:http://www.cancer.gov/cancertopics/types/vulvar""}]}"