assertion  retraction  graph  subject             predicate        object                      datatype    annotation
1          0           graph  obo:UBERON_0004121  rdfs:label       ectoderm-derived structure  xsd:string  
1          0           graph  obo:UBERON_0004121  oio:id           UBERON:0004121              xsd:string  
1          0           graph  obo:UBERON_0004121  rdfs:subClassOf  obo:UBERON_0000061          _IRI        
1          0           graph  obo:UBERON_0004121  rdf:type         owl:Class                   _IRI