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Submitted on: 16 April 2006.
Revised on: 28 May 2006.
Accepted on: 26 July 2006.
___________________Frontiers in Molecular Biosciences
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Submitted on: 09 September 2013.
Revised on: 17 November 2013.
Accepted on: 09 December 2013.
___________________Frontiers in Molecular Biosciences
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