The following DataNodes have no identifier: 2
http://classic.wikipathways.org/instance/WP5070_r120453 http://rdf.wikipathways.org/Pathway/WP5070_r120453/DataNode/d0342 (csrB)
http://classic.wikipathways.org/instance/WP5070_r120453 http://rdf.wikipathways.org/Pathway/WP5070_r120453/DataNode/f6920 (csrC)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier