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Submitted on: 25 February 1999.
Revised on: 17 March 1999.
Accepted on: 16 April 1999.
___________________Frontiers in Molecular Biosciences
Submitted on: 02 January 2007.
Revised on: 28 April 2007.
Accepted on: 13 May 2007.
___________________Frontiers in Molecular Biosciences
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Submitted on: 02 April 2010.
Revised on: 30 May 2010.
Accepted on: 06 July 2010.
___________________Frontiers in Molecular Biosciences
Submitted on: 18 January 2009.
Revised on: 05 May 2009.
Accepted on: 24 June 2009.
___________________Frontiers in Molecular Biosciences
Submitted on: 27 September 2006.
Revised on: 28 December 2006.
Accepted on: 04 February 2007.
___________________Frontiers in Molecular Biosciences
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