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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 (December 1, 2017) for new and updated features.
Announcement: KEGG NETWORK released

egg Main entry point to the KEGG web service
KEGG2
KEGG Table of Contents   [Update notes | Release history]
egg Data-oriented entry points
KEGG PATHWAY
KEGG pathway maps
KEGG BRITE
BRITE hierarchies and tables
KEGG MODULE
KEGG modules
KEGG ORTHOLOGY
KO functional orthologs   [Annotation]
KEGG GENOME
Genomes   [Virus | Plant]
KEGG GENES
Genes and proteins   [SeqData]
KEGG COMPOUND
Small molecules
KEGG GLYCAN
Glycans
KEGG REACTION
Biochemical reactions   [RModule]
KEGG ENZYME
Enzyme nomenclature
KEGG NETWORK
Disease-related network elements New!
KEGG DISEASE
Human diseases   [Cancer | Pathogen]
KEGG DRUG
Drugs   [New drug approvals]
KEGG MEDICUS
Health information resource   [Drug labels search]
egg Organism-specific entry points
KEGG Organisms
Enter org code(s)   hsa   hsa eco
egg Analysis tools
KEGG Mapper
KEGG PATHWAY/BRITE/MODULE mapping tools
BlastKOALA
Genome annotation and KEGG mapping
GhostKOALA
Metagenome annotation and KEGG mapping
BLAST/FASTA
Sequence similarity search
SIMCOMP
Chemical structure similarity search