Table 2.

KEGG object identifiers

Release	Database	Object identifier
1995	KEGG PATHWAY	map number
	KEGG GENOME	organism code (T number)
	KEGG GENES	locus_tag/NCBI GeneID
	KEGG ENZYME	EC number
	KEGG COMPOUND	C number
2001	KEGG REACTION	R number
2002	KEGG ORTHOLOGY	K number
2003	KEGG GLYCAN	G number
2004	KEGG RPAIR	A number
2005	KEGG BRITE	br number
	KEGG DRUG	D number
2008	KEGG MODULE	M number
	KEGG DISEASE	H number

See http://www.genome.jp/kegg/kegg3.html for details.