Table 1.

KEGG databases

Category	Database	Content
Systems Information	KEGG PATHWAY	Pathway maps
	KEGG BRITE	Functional hierarchies
	KEGG MODULE	Pathway modules
	KEGG DISEASE	Human diseases
	KEGG DRUG	Drugs
Genomic Information	KEGG ORTHOLOGY	KEGG orthology (KO) groups
	KEGG GENOME	KEGG organisms
	KEGG GENES	Genes in high-quality genomes
	KEGG SSDB	Sequence similarities and best hit relations
	KEGG DGENES	Genes in draft genomes
	KEGG EGENES	Genes as EST contigs
Chemical Information	KEGG COMPOUND	Metabolites and other small molecules
	KEGG GLYCAN	Glycans
	KEGG REACTION	Biochemical reactions
	KEGG RPAIR	Reactant pair chemical transformations
	KEGG ENZYME	Enzyme nomenclature