The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP2908_r80898 http://rdf.wikipathways.org/Pathway/WP2908_r80898/DataNode/fe9df (FTH1RNA)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier