The following DataNodes have no identifier: 4
http://classic.wikipathways.org/instance/WP1248_r106839 http://rdf.wikipathways.org/Pathway/WP1248_r106839/DataNode/e1559 (B15)
http://classic.wikipathways.org/instance/WP1248_r106839 http://rdf.wikipathways.org/Pathway/WP1248_r106839/DataNode/b30f8 (CI-SGDH)
http://classic.wikipathways.org/instance/WP1248_r106839 http://rdf.wikipathways.org/Pathway/WP1248_r106839/DataNode/b9d35 (FASN2A)
http://classic.wikipathways.org/instance/WP1248_r106839 http://rdf.wikipathways.org/Pathway/WP1248_r106839/DataNode/a43ad (LOC727762)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier