SWISS-PROT is a curated protein sequence database with a high level of annotation (such as description of the function of a protein, its domain structure, post-translational modification, variants, etc), a minimal level of redundancy and a high level of integration with other databases. An ongoing project is to maintain the glycosyltransferase family of enzymes with comprehensive annotation and documentation in the SWISS-PROT database and to represent the most recent research developments.