The following genes with an identifier have been found but that do not have a mapping to Ensembl: 3
http://classic.wikipathways.org/instance/WP4758_r129306 MT-TL1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP4758_r129306 TRN-GTT4-1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP4758_r129306 MT-TI with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping