The following DataNodes have no identifier: 2
http://classic.wikipathways.org/instance/WP2233_r120941 http://rdf.wikipathways.org/Pathway/WP2233_r120941/DataNode/c0bca (SNF-12)
http://classic.wikipathways.org/instance/WP2233_r120941 http://rdf.wikipathways.org/Pathway/WP2233_r120941/DataNode/f80a0 (SNF-12)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier