The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP5063_r118833 http://rdf.wikipathways.org/Pathway/WP5063_r118833/DataNode/beee1 (TCR)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier