A metabolic network is the complete set of metabolic and physical processes that determine the
biochemical properties of a
cell. As such, these networks comprise the chemical reactions of
metabolic pathways, as well as the regulatory interactions that guide these reactions.
With the sequencing of complete
genomes, it is now possible to reconstruct the network of biochemical reactions in many organisms, from bacteria to human. Several of these networks are available online: Kyoto Encyclopedia of Genes and Genomes (KEGG),
 and metaTIGER.
 Metabolic networks are powerful tools for studying and modelling metabolism.