Submitted on: 24 June 2012.
Revised on: 30 September 2012.
Accepted on: 23 October 2012.
___________________Chemical Biology Letters---SCIENCEIN PUBLICATIONS
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Submitted on: 01 September 2009.
Revised on: 21 November 2009.
Accepted on: 05 January 2010.
___________________Chemical Biology Letters---SCIENCEIN PUBLICATIONS
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