The following genes with an identifier have been found but that do not have a mapping to Ensembl: 3
http://classic.wikipathways.org/instance/WP124_r135188 Ugt1a6 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP124_r135188 UGT1A9 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP124_r135188 Ugt1a1 with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping