The following DataNodes have no identifier: 9
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier
The following genes with an identifier have been found but that do not have a mapping to Ensembl: 2
http://classic.wikipathways.org/instance/WP1090_r117446 PTGIS with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1090_r117446 ALOX5AP with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping