The following DataNodes have no identifier: 2
http://classic.wikipathways.org/instance/WP4533_r103380 http://rdf.wikipathways.org/Pathway/WP4533_r103380/DataNode/a7b38 (Mob)
http://classic.wikipathways.org/instance/WP4533_r103380 http://rdf.wikipathways.org/Pathway/WP4533_r103380/DataNode/b36d6 (Sav)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier