The following genes with an identifier have been found but that do not have a mapping to Ensembl: 4
http://classic.wikipathways.org/instance/WP654_r125336 Bcl2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP654_r125336 H2afx with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP654_r125336 Atm with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP654_r125336 Cdk2 with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping