The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP3120_r117516 http://rdf.wikipathways.org/Pathway/WP3120_r117516/DataNode/bfd2b (C/EBPB)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier