assertion  retraction  graph  subject    predicate    object                                                                                                                                             datatype    annotation
1          0           graph  DOID:7665  IAO:0000115  An ovarian primitive germ cell tumor that has_material_basis_in trophoblastic cells and develops in the absence of a preceding gestational event.  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/pubmed/20090265""}]}"