The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP1236_r105894 http://rdf.wikipathways.org/Pathway/WP1236_r105894/DataNode/f61f1 (SORD)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier