assertion retraction graph subject predicate object datatype annotation 1 0 graph ONTIE:0003611 rdfs:label ULOD (ng/mL) xsd:string 1 0 graph ONTIE:0003611 IAO:0000234 CoVIC-DB xsd:string 1 0 graph ONTIE:0003611 IAO:0000115 The upper limit of detection in ng/ml. xsd:string 1 0 graph ONTIE:0003611 rdfs:subClassOf ONTIE:0003575 _IRI 1 0 graph ONTIE:0003611 rdf:type owl:Class _IRI