The following genes with an identifier have been found but that do not have a mapping to Ensembl: 6
http://classic.wikipathways.org/instance/WP189_r117889 Fpr-rs1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP189_r117889 Olfr242 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP189_r117889 Q9EPV1 with datasource UniProtKB
http://classic.wikipathways.org/instance/WP189_r117889 Olfr157 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP189_r117889 Olfr1355 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP189_r117889 Q9EPG0 with datasource UniProtKB
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping