assertion  retraction  graph  subject             predicate        object              datatype    annotation
1          0           graph  obo:UBERON_0015228  rdfs:label       circulatory organ   xsd:string  
1          0           graph  obo:UBERON_0015228  oio:id           UBERON:0015228      xsd:string  
1          0           graph  obo:UBERON_0015228  rdfs:subClassOf  obo:UBERON_0003103  _IRI        
1          0           graph  obo:UBERON_0015228  rdf:type         owl:Class           _IRI