The following DataNodes have no identifier: 3
http://classic.wikipathways.org/instance/WP3154_r117473 http://rdf.wikipathways.org/Pathway/WP3154_r117473/DataNode/f7076 (ACC1)
http://classic.wikipathways.org/instance/WP3154_r117473 http://rdf.wikipathways.org/Pathway/WP3154_r117473/DataNode/dcd84 (MEF2B)
http://classic.wikipathways.org/instance/WP3154_r117473 http://rdf.wikipathways.org/Pathway/WP3154_r117473/DataNode/e05b7 (PRKACG)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier