MetExplore is a web-server that allows to build, curate and analyse genome-scale metabolic networks. MetExplore stores metabolic networks of 160 organisms into a relational database (freely available on demand). Information about metabolic networks mainly come from BioCyc-like databases. Two BioCyc-like databases contain information about several organisms: PlantCyc and MetaCyc. MetExplore contains also the information about metabolites stored in Note that there is no information about reactions in this database and is only useful to identify compounds from masses. Several genome-scale models designed for Flux Balance Analysis have also been imported into MetExplore. ..