The following genes with an identifier have been found but that do not have a mapping to Ensembl: 4
http://classic.wikipathways.org/instance/WP964_r111047 ABL1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP964_r111047 LOC464259 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP964_r111047 CCNB3 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP964_r111047 TFDP1 with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping