The following DataNodes have no identifier: 3
http://classic.wikipathways.org/instance/WP3931_r127829 http://rdf.wikipathways.org/Pathway/WP3931_r127829/DataNode/f6f8a (IKK)
http://classic.wikipathways.org/instance/WP3931_r127829 http://rdf.wikipathways.org/Pathway/WP3931_r127829/DataNode/a69 (Myc)
http://classic.wikipathways.org/instance/WP3931_r127829 http://rdf.wikipathways.org/Pathway/WP3931_r127829/DataNode/cc7 (actr2b)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier