assertion  retraction  graph  subject    predicate    object                                                                                                                                                                                                           datatype    annotation
1          0           graph  DOID:3873  IAO:0000115  A medulloblastoma that is characterized by the presence of nodular, collagenous areas which do not contain reticulin, surrounded by hypercellular areas which contain an intercellular reticulin fiber network.  xsd:string  "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://pubmed.ncbi.nlm.nih.gov/32304218/""},{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4910646/""}]}"