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EnPDB database is made by reformatting PDB in a way allowing for extended search possibilities on PDB. To broaden the possibilities of search in the database additional fields are added that are absent in PDB. Coordinates of atoms are not included in the EnPDB. Database access is realised by means of SRS system (Sequence Retrieval System). EnPDB format implies full indexing of all the fields. EnPDB is integrated by means of hyperlinks with different databases (SWISS-PROT, PIR, TRRD, etc).