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Each object (database entry) is identified by the KEGG identifier (kid), which generally takes the form of a prefix followed by a five-digit number, and can be retrieved by appending \/entry\/kid in the URL. The KEGG pathway map viewer, the Brite hierarchy viewer and the newly released KEGG genome browser can be launched by appending \/pathway\/kid, \/brite\/kid and \/genome\/kid, respectively, in the URL. Together with an improved annotation procedure for KO (KEGG Orthology) assignment, an increasing number of eukaryotic genomes have been included in KEGG for better representation of organisms in the taxonomic tree. Multiple taxonomy files are generated for classification of KEGG organisms and viruses, and the Brite hierarchy viewer is used for taxonomy mapping, a variant of Brite mapping in the new KEGG Mapper suite. The taxonomy mapping enables analysis of, for example, how functional links of genes in the pathway and physical links of genes on the chromosome are conserved among organism groups.<\/jats:p>","DOI":"10.1093\/nar\/gkac963","type":"journal-article","created":{"date-parts":[[2022,10,13]],"date-time":"2022-10-13T11:32:30Z","timestamp":1665660750000},"page":"D587-D592","source":"Crossref","is-referenced-by-count":5083,"title":["KEGG for taxonomy-based analysis of pathways and genomes"],"prefix":"10.1093","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6123-540X","authenticated-orcid":false,"given":"Minoru","family":"Kanehisa","sequence":"first","affiliation":[{"name":"Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miho","family":"Furumichi","sequence":"additional","affiliation":[{"name":"Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoko","family":"Sato","sequence":"additional","affiliation":[{"name":"Digital Lab Division, Fujitsu Limited, Saiwai-ku , Kawasaki, Kanagawa 212-0014, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masayuki","family":"Kawashima","sequence":"additional","affiliation":[{"name":"Network Support Co. 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