assertion  retraction  graph  subject    predicate    object                                                                                                                                                                                                     datatype    annotation
1          0           graph  DOID:4860  IAO:0000115  A brain stem glioma that is characterized by mass lesion of the brainstem, associated cranial nerve nuclei and long tracts, has_material_basis_in abnormally proliferating cells derives_from astrocytes.  xsd:string  "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007638""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://en.wikipedia.org/wiki/Astrocytoma""}]}"