assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:3068 IAO:0000115 A malignant astrocytoma characterized by the presence of small areas of necrotizing tissue that is surrounded by anaplastic cells as well as the presence of hyperplastic blood vessels, and that has_material_basis_in abnormally proliferating cells derives_from multiple cell types including astrocytes and oligondroctyes. 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:http://cancergenome.nih.gov/cancersselected/glioblastomamultiforme""},{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:http://en.wikipedia.org/wiki/Glioblastoma_multiforme""},{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pubmed/20129251""},{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pubmed/23029035""}]}"