assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0081277 IAO:0000115 A high grade glioma that is characterized by the absence of histone H3, IDH1, and IDH2 mutations. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://pubmed.ncbi.nlm.nih.gov/34858308/""}]}"