1 PUBLIC DOMAIN NOTICE 2 National Center for Biotechnology Information 3 4This software/database is a "United States Government Work" under the 5terms of the United States Copyright Act. It was written as part of 6the author's official duties as a United States Government employee and 7thus cannot be copyrighted. This software/database is freely available 8to the public for use. The National Library of Medicine and the U.S. 9Government have not placed any restriction on its use or reproduction. 10 11Although all reasonable efforts have been taken to ensure the accuracy 12and reliability of the software and data, the NLM and the U.S. 13Government do not and cannot warrant the performance or results that 14may be obtained by using this software or data. The NLM and the U.S. 15Government disclaim all warranties, express or implied, including 16warranties of performance, merchantability or fitness for any particular 17purpose. 18 19Please cite the author in any work or product based on this material. 20