assertion  retraction  graph  subject    predicate    object                                                                                                                                                                                                                  datatype    annotation
1          0           graph  DOID:6639  IAO:0000115  A choriocarcinoma characterized by extraembryonic differentiation along trophoblastic lines and high serum and CSF levels of HCG/_-HCG, has_material_basis_in abnormally proliferating cells, derives_from germ cells.  xsd:string  "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007645""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:http://www.ajnr.org/content/31/10/1994""}]}"