The Biomart system (http://www.biomart.org/) is a flexible data warehouse aimed at complex interlinked biological data sets. Originally developed for the Ensembl project it has now been generalized to allow other data providers access to its functionality. As an example the EBI's Biomart instance contains data from Ensembl, VEGA, DbSNP, UniProt and MSD data sets - Taverna's biomart query integrati