The following DataNodes have no identifier: 9
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier
The following genes with an identifier have been found but that do not have a mapping to Ensembl: 1
http://classic.wikipathways.org/instance/WP2637_r127757 Histone H3 with datasource UniProtKB
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping