assertion  retraction  graph  subject    predicate    object                                                                                                                                                                                                                             datatype    annotation
1          0           graph  DOID:4207  IAO:0000115  A brain stem cancer in the infratentorial region of the brain in childhood, characterized by mass lesion of the brainstem, associated cranial nerve nuclei and long tracts, has_material_basis_in abnormally proliferating cells.  xsd:string  "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007636""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=16.12d&ns=NCI_Thesaurus&code=C5802""}]}"