The UniProt web site supplies direct links to UniPathway (http://www.grenoble.prabi.fr/obiwarehouse/unipathway), which provides more detailed information on pathways, sub-pathways and biochemical reactions. By making use of UniProtKB/Swiss-Prot richness, UniPathway is able to offer several perspectives to understand metabolism: a protein perspective, a genomic perspective and a taxonomic perspective. The chemical perspective is based on KEGG LIGAND compounds and reactions with the kind permission of the Kanehisa Laboratory (16).