KEGG objects are highly integrated by mutual links within KEGG, and are also linked to related entries in outside databases. The following table shows the links maintained by KEGG. There are additional links maintained by GenomeNet (see LinkDB), including those created by outside databases.

Database Internal links Outside links
ID conversion1 Other
pathway module ko genome <org> compound glycan reaction rclass enzyme disease drug pubmed biosystems go umbbd
brite module ko genome <org> compound glycan reaction rclass disease drug environ
module pathway brite ko genome <org> compound glycan reaction enzyme pubmed biosystems
ko pathway brite module genes <org> vg ag reaction rclass enzyme disease drug dgroup pubmed cog go tc cazy
genome pathway brite module <org> vg ag compound disease pubmed taxonomy assembly genbank refseq
<org> pathway brite module ko genome enzyme (disease drug dgroup)2 ncbi-geneid ncbi-proteinid uniprot pfam <original_dbs>3
vg ko genome enzyme ncbi-geneid ncbi-proteinid uniprot pfam taxonomy refseq
ag ko genome enzyme pubmed ncbi-proteinid uniprot pfam taxonomy genbank
compound pathway brite module genome glycan reaction enzyme disease drug environ pubchem chebi cas chembl lipidmaps lipidbank knapsack pdb-ccd 3dmet nikkaji
glycan pathway brite module compound reaction enzyme disease pubchem chebi ccsd glycomedb jcggdb lipidbank glycoepitope
reaction pathway brite module ko compound glycan rclass enzyme
rclass pathway brite ko reaction enzyme
enzyme pathway module ko <org> vg ag compound glycan reaction rclass explorenz iubmb expasy umbbd brenda cas
disease pathway brite ko genome hsa compound glycan drug dgroup pubmed icd-10 mesh omim medlineplus
drug pathway brite ko hsa compound disease dgroup environ atc jtc ndc yj pubchem chebi cas chembl drugbank pdb-ccd ligandbox nikkaji
dgroup ko hsa disease drug
environ brite compound drug cas

1 Outside links for ID conversion allow, for example, outside identifiers to be used in KEGG Mapper analysis. The Conv ID tool in KEGG Mapper may be used to convert GeneIDs, ProteinIDs or UniProt IDs to KEGG identifiers.
2 Parentheses for hsa (Homo sapiens) only.
3 <original_dbs> include: mirbase ensembl cyorf cyanobase nite rhizobase genedb pasteur flybase vega vectorbase ... (total of >70 dbs)

Last updated: June 27, 2017