assertion retraction graph subject predicate object datatype annotation 1 0 graph obo:UBERON_0000483 rdfs:label epithelium xsd:string 1 0 graph obo:UBERON_0000483 oio:id UBERON:0000483 xsd:string 1 0 graph obo:UBERON_0000483 rdfs:subClassOf obo:UBERON_0000479 _IRI 1 0 graph obo:UBERON_0000483 rdf:type owl:Class _IRI