assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0080879 IAO:0000115 A high grade glioma that has_material_basis_in mutations in the genes encoding histones. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.annualreviews.org/doi/abs/10.1146/annurev-cancerbio-030617-050143""}]}"