KEGG: Kyoto Encyclopedia of Genes and Genomes

KEGG is a database resource for understanding high-level functions and utilities of the biological system, such as the cell, the organism and the ecosystem, from molecular-level information, especially large-scale molecular datasets generated by genome sequencing and other high-throughput experimental technologies.
See Release notes (April 1, 2025) for new and updated features.

New article: KEGG: biological systems database as a model of the real world

KEGG Database

KEGG2: KEGG Table of Contents [Update notes | Release history]

KEGG PATHWAY: KEGG pathway maps
KEGG BRITE: BRITE hierarchies and tables
KEGG MODULE: KEGG modules
KEGG ORTHOLOGY: KO functional orthologs
KEGG GENES: Genes and proteins [Statistics]
KEGG GENOME: Genomes [Taxonomy | Synteny]
KEGG Virus: Virus-organism relationships
KEGG Organisms: Enter org code(s)
KEGG COMPOUND: Small molecules
KEGG GLYCAN: Glycans
KEGG REACTION: Biochemical reactions [RModule]
KEGG ENZYME: Enzyme nomenclature
KEGG NETWORK: Disease-related network variations
KEGG DISEASE: Human diseases
KEGG DRUG: Drugs [New drug approvals]

KEGG MEDICUS: Health information resource [Drug labels search]

Analysis Tools

KEGG Mapper: PATHWAY/BRITE/MODULE mapping tools
KEGG Web Apps: Pathway viewer with coloring features, etc.
KEGG Syntax: Conserved gene, gene set and gene order analysis
KEGG Annotation: KO assignment and validation
BlastKOALA: BLAST-based KO annotation and KEGG mapping
GhostKOALA: GHOSTX-based KO annotation and KEGG mapping
BLAST/FASTA: Sequence similarity search
SIMCOMP: Chemical structure similarity search