assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:2021 IAO:0000115 A female reproductive organ cancer that is located_in the placenta. xsd:string "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007645""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.medstarcancer.org/conditions/gynecologic-cancer/placenta-cancer/""},{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pubmed/26156670,""}]}"