The following genes with an identifier have been found but that do not have a mapping to Ensembl: 11
http://classic.wikipathways.org/instance/WP1455_r126351 IL1B with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 PP2A with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 ITGB3 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 IL1R1 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 SLC6A4 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 TPH2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 MAOA with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 Syntaxin 1A with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 Hic-5 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 SCAMP2 with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP1455_r126351 nNOS with datasource Entrez Gene
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping