assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0080705 IAO:0000115 A medulloblastoma SHH activated that is characterized as a molecular subtype by activation of the sonic hedgehog (SHH) pathway and the absence of TP53 mutations. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4743072/""}]}"