assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:7191 IAO:0000115 An ovarian cystadenoma that is characterized by the presence of endometrial tissue. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://pubmed.ncbi.nlm.nih.gov/30725635/""}]}"