A systematic comparison of the MetaCyc and KEGG pathway databases

BMC Bioinformatics

Table 5 Comparison of reaction data content in MetaCyc and KEGG

Category	MetaCyc	KEGG
Reaction instances	10262	8879
Duplicate reactions	279	341
Reactions with comments	3206	3022
Unbalanced reactions (not counting hydrogen)	474	872
Unbalanced reactions (counting hydrogen)	532	1475
Mean associated pathways	0.84	0.90

We report the number of reactions, the number of duplicate reactions, the number of reactions with comments, the number of unbalanced reactions disregarding hydrogen imbalance, the number of unbalanced reactions including hydrogen imbalance, and the average number of associated pathways. Associated pathways of a reaction include base pathways and superpathways in MetaCyc and KEGG modules and maps.

ISSN: 1471-2105