The following genes with an identifier have been found but that do not have a mapping to Ensembl: 12
http://classic.wikipathways.org/instance/WP270_r140255 Maob with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Cyp1a2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Cyp4f1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Wars with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Rnf25 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Cyp2d2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Aox1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Mdm2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Dd5 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Aldh1a2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Cyp2c80 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP270_r140255 Cyp19a1 with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping