Number of references (2026/10/23)
| total | 79,190 |
| pathway | 6,914 |
| brite | 448 |
| module | 1,240 |
| ko | 31,303 |
| genome | 8,779 |
| ag | 3,220 |
| glycan | 1,023 |
| reaction | 2,183 |
| enzyme | 16,500 |
| network | 2,972 |
| variant | 2,710 |
| disease | 12,010 |
KEGG Database
| Category | Entry point | Data object | Content | KEGG identifier* |
| Systems information |
PATHWAY | pathway | KEGG pathway maps | map | ko, ec, rn, <org> |
| BRITE | brite | Brite hierarchies Brite tables |
br, jp, ko | <org> br, jp |
|
| MODULE | module | KEGG modules | M | <org>_M | |
| Genomic information |
KO | KO | KEGG Orthology (KO) functional orthologs | K |
| GENES | <org> ag vg vp |
Genes in KEGG organisms Addendum proteins from literature Viral genes Viral mature peptides |
<org>:<gene> ag:<protein> vg:<gene> vp:<gene-no> |
|
| GENOME Virus |
genome vtax vgenome |
KEGG organisms genomes KEGG viruses genomes Pathogenic viruses |
T, gn:<org> gn:<vtax> T |
|
| Chemical information |
COMPOUND | compound | Metabolites and other small molecules | C |
| GLYCAN | glycan | Glycans | G | |
| REACTION RModule |
reaction rclass rmodule |
Biochemical reactions Reaction class Reaction modules |
R RC RM |
|
| Enzyme | enzyme | Enzyme nomenclature with sequence data | ec:<ecnum> | |
| Health information |
NETWORK | network ntmap variant |
Network elements Network variation maps Human gene variants |
N nt hsa_var:<gene_vno> |
| DISEASE | disease | Human diseases | H | |
| DRUG | drug dgroup |
Drugs Drug groups |
D DG |
|
| MEDICUS | Japanese drug labels provided by JAPIC | N/A (outside databases) | ||
| FDA drug labels linked to DailyMed |
* KEGG identifier = prefix followed by five digit-number or combination of dbname:entryname
KEGG Analysis tools
Data viewers
| Data object | Viewer | WebLinks form |
| All KEGG data objects | DBGET viewer | https://www.kegg.jp/entry/<kid> |
| Pathway maps | Pathway viewer | https://www.kegg.jp/pathway/<kid> |
| Brite hierarchies | Brite viewer | https://www.kegg.jp/brite/<kid> |
| KEGG modules | Module viewer | https://www.kegg.jp/module/<kid> |
| Genomes | Genome browser | https://www.kegg.jp/genome/<kid> |
| Network variation maps | Network viewer | https://www.kegg.jp/network/<kid> |
Analysis Tools
| Tool | Feature |
| KEGG Annotation | KO assignment tools including BlastKOALA and GhostKOALA |
| KEGG Mapper | KEGG mapping tools including Reconstruct, Search, Color, Join and MWsearch |
| KEGG Syntax | Genome alignment, Genome similarity, Taxonomy mapping and User data analysis tools |
| KEGG Web Apps | Pathway viewer, Brite viewer and Genome browser with mapping capabilities |
| BLAST FASTA |
Sequence similarity search (served by GenomeNet) |
| SIMCOMP SUBCOMP |
Chemical structure similarity search (served by GenomeNet) |
See more tools at GenomeNet.
Documents
| Document |
| KEGG database entry format |
| KEGG Weblinks |
| Map coloring GUI |
| Map coloring URL |
| KEGG API manual |
| KEGG Markup Language (KGML) |
Last updated: September 7, 2026