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EBI's CSA contains data documenting enzyme active sites and catalytic residues in enzymes of 3D structure. Entries in CSA may be original hand-annotated entries from primary literature or homologous entries found by PSI-BLAST alignment.
The Restriction Enzyme Database is a collection of information about restriction enzymes, methylases, the microorganisms from which they have been isolated, recognition sequences, cleavage sites, methylation specificity, the commercial availability of the enzymes, and references - both published and unpublished observations (dating back to 1952). REBASE is updated daily and is constantly expanding.