The following DataNodes have no identifier: 4
http://classic.wikipathways.org/instance/WP1186_r117442 http://rdf.wikipathways.org/Pathway/WP1186_r117442/DataNode/fb3 (Acetyl-CoA)
http://classic.wikipathways.org/instance/WP1186_r117442 http://rdf.wikipathways.org/Pathway/WP1186_r117442/DataNode/e89f4 (HMG-CoA)
http://classic.wikipathways.org/instance/WP1186_r117442 http://rdf.wikipathways.org/Pathway/WP1186_r117442/DataNode/c3b (IDI1)
http://classic.wikipathways.org/instance/WP1186_r117442 http://rdf.wikipathways.org/Pathway/WP1186_r117442/DataNode/f92 (LSS)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier