MatrixDB, a database focused on extracellular protein–protein and protein–carbohydrate interactions

Summary: MatrixDB (http://matrixdb.ibcp.fr) is a database reporting mammalian protein–protein and protein–carbohydrate interactions involving extracellular molecules. It takes into account the full interaction repertoire of the extracellular matrix involving full-length molecules, fragments and multimers. The current version of MatrixDB contains 1972 interactions corresponding to 4412 experiments and involving 259 extracellular biomolecules. Availability: MatrixDB is freely available at http://matrixdb.ibcp.fr Contact: nicolas.thierry-mieg@imag.fr; s.ricard-blum@ibcp.fr Supplementary information: Supplementary data are available at Bioinformatics online.