assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:7305 IAO:0000115 A malignant astrocytoma that is characterized by tumor cells with characteristics suggestive of an astrocytic origin (positive for GFAP), arranged perivascularly. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.futuremedicine.com/doi/full/10.2217/cns-2018-0012""},{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5910607/""}]}"