The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP3230_r117510 http://rdf.wikipathways.org/Pathway/WP3230_r117510/DataNode/b04 (CEBPB)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier