The following DataNodes have no identifier: 2
http://classic.wikipathways.org/instance/WP5145_r124659 http://rdf.wikipathways.org/Pathway/WP5145_r124659/DataNode/da2ee (43S)
http://classic.wikipathways.org/instance/WP5145_r124659 http://rdf.wikipathways.org/Pathway/WP5145_r124659/DataNode/e0700 (80S)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier