The following DataNodes have no identifier: 2
http://classic.wikipathways.org/instance/WP3152_r117495 http://rdf.wikipathways.org/Pathway/WP3152_r117495/DataNode/cdda7 (CYP2C9)
http://classic.wikipathways.org/instance/WP3152_r117495 http://rdf.wikipathways.org/Pathway/WP3152_r117495/DataNode/f35cf (CYP2C9)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier