assertion  retraction  graph  subject             predicate        object                     datatype    annotation
1          0           graph  obo:UBERON_0007100  rdfs:label       primary circulatory organ  xsd:string  
1          0           graph  obo:UBERON_0007100  oio:id           UBERON:0007100             xsd:string  
1          0           graph  obo:UBERON_0007100  rdfs:subClassOf  obo:UBERON_0015228         _IRI        
1          0           graph  obo:UBERON_0007100  rdf:type         owl:Class                  _IRI