                            PUBLIC DOMAIN NOTICE
               National Center for Biotechnology Information

  This software/database is a "United States Government Work" under the
  terms of the United States Copyright Act.  It was written as part of
  the author's official duties as a United States Government employee and
  thus cannot be copyrighted.  This software/database is freely available
  to the public for use. The National Library of Medicine and the U.S.
  Government have not placed any restriction on its use or reproduction.

  Although all reasonable efforts have been taken to ensure the accuracy
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  Government do not and cannot warrant the performance or results that
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  Government disclaim all warranties, express or implied, including
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  Please cite the author in any work or product based on this material.
