assertion  retraction  graph  subject    predicate    object                                                                                                                                                                                         datatype    annotation
1          0           graph  DOID:2133  IAO:0000115  A central nervous system cancer develops from transformed cells of mesenchymal origin located_in brain and spine, has_material_basis_in abnormally proliferating cells derives_from mesoderm.  xsd:string  "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007638""},{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007645""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://en.wikipedia.org/wiki/Sarcoma""},{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pubmed/12170093""}]}"