The following genes with an identifier have been found but that do not have a mapping to Ensembl: 7
http://classic.wikipathways.org/instance/WP139_r140253 Abcd2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP139_r140253 CYP27B1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP139_r140253 Nr1h4 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP139_r140253 Cyp1a2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP139_r140253 Rarg with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP139_r140253 Ppara with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP139_r140253 Vdr with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping