assertion  retraction  graph  subject    predicate    object                                                                                                                                                                                                     datatype    annotation
1          0           graph  DOID:6514  IAO:0000115  An ovarian endodermal sinus tumor that is characterized by a polyvesicular vitelline pattern, which involves vesicular structures with eccentric constrictions surrounded by a dense spindle cell stroma.  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.pathologyoutlines.com/topic/ovarytumoryolksac.html""}]}"