The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP2872_r126379 http://rdf.wikipathways.org/Pathway/WP2872_r126379/DataNode/b8a9d (FBS)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier