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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).