The following DataNodes have no identifier: 3
http://classic.wikipathways.org/instance/WP1297_r124808 http://rdf.wikipathways.org/Pathway/WP1297_r124808/DataNode/a29e9 (ARAT)
http://classic.wikipathways.org/instance/WP1297_r124808 http://rdf.wikipathways.org/Pathway/WP1297_r124808/DataNode/b60c6 (Bcdo2)
http://classic.wikipathways.org/instance/WP1297_r124808 http://rdf.wikipathways.org/Pathway/WP1297_r124808/DataNode/b67a1 (MAPK)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier