The following genes with an identifier have been found but that do not have a mapping to Ensembl: 7
http://classic.wikipathways.org/instance/WP40_r128001 Zap70 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP40_r128001 Col3a1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP40_r128001 Il2rb with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP40_r128001 Ifng with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP40_r128001 Lamb2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP40_r128001 Fn1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP40_r128001 Cd28 with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping