The following DataNodes have no identifier: 4
http://classic.wikipathways.org/instance/WP1078_r95747 http://rdf.wikipathways.org/Pathway/WP1078_r95747/DataNode/b2e (CDK)
http://classic.wikipathways.org/instance/WP1078_r95747 http://rdf.wikipathways.org/Pathway/WP1078_r95747/DataNode/bec (CDK)
http://classic.wikipathways.org/instance/WP1078_r95747 http://rdf.wikipathways.org/Pathway/WP1078_r95747/DataNode/b4c (E2f)
http://classic.wikipathways.org/instance/WP1078_r95747 http://rdf.wikipathways.org/Pathway/WP1078_r95747/DataNode/fd1 (E2f)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier