KEGG
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Kanehisa Lab
 
  PMID, DOI, author, title, journal
Search references cited in KEGG
Number of references (2025/4/28)
total74,969
pathway6,780
brite445
module1,182
ko29,260
genome7,813
agenes3,086
glycan942
reaction2,117
enzyme16,223
network2,779
variant2,212
disease11,458
Search for

KEGG Database

Data-oriented entry points

Category Entry point Database Data object 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
RModule		 MODULE Modules
Reaction modules		 M | <org>_M
RM
Genomic
information		 KO KO KEGG Orthology (KO) for functional orthologs K
GENES
Virus

SeqData		 GENES KEGG organism genes and proteins
Virus genes and proteins
Virus mature peptides
Functionally characterized proteins from literature		 <org>:<gene>
vg:<gene>
vp:<gene-no>
ag:<protein>
GENOME GENOME KEGG organisms genomes
KEGG viruses genomes		 T, gn:<org>
gn:<vtax>
Chemical
information		 COMPOUND COMPOUND Metabolites and other small molecules C
GLYCAN GLYCAN Glycans G
REACTION REACTION
RCLASS		 Biochemical reactions
Reaction class		 R
RC
Enzyme ENZYME Enzyme nomenclature with sequence data ec:<ecnum>
Health
information		 NETWORK NETWORK

VARIANT		 Network variation maps
Network elements
Human gene variants		 nt
N
hsa_var:<gene_vno>
DISEASE DISEASE Human diseases H
DRUG DRUG
DGROUP		 Drugs
Drug groups		 D
DG
MEDICUS JAPIC Japanese drug labels N/A (outside databases)
DailyMed FDA drug labels (links only)

* KEGG identifier = prefix followed by five digit-number or combination of dbname:entryname

Four types of database navigation bars

KEGG2 PATHWAY BRITE MODULE KO GENES  COMPOUND  NETWORK  DISEASE  DRUG
KEGG2 PATHWAY BRITE MODULE KO GENES    GENOME    Virus    SeqData    Enzyme
KEGG2 PATHWAY BRITE MODULE KO COMPOUND GLYCAN REACTION RModule
KEGG2 PATHWAY BRITE MODULE KO NETWORK DISEASE DRUG MEDICUS

Organism-specific entry points

KEGG organisms - list of currently available organisms with organism codes and organism group names

Enter organism code or T number    (examples) hsa  eco  T01001  T00007

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>
<kid>, KEGG identifier

Analysis Tools

  • Annotation
  • Annotation
    • Tool Feature
    KEGG Mapper KEGG mapping tools including Reconstruct, Search, Color, Join and MWsearch
    KEGG Web Apps Pathway viewer, Brite viewer and Genome browser with mapping capabilities
    KEGG Syntax Taxonomy mapping, Genome alignment and Synteny analysis tools
    KEGG Annotation Ortholog table and KO assignment tools
    BlastKOALA
    GhostKOALA    		 Automatic KO assignment
    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: April 1, 2025