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Submitted on: 18 July 2013.
Revised on: 12 October 2013.
Accepted on: 05 November 2013.
___________________Biology Methods & Protocols---OXFORD UNIV PRESS
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Submitted on: 16 June 1998.
Revised on: 07 July 1998.
Accepted on: 02 September 1998.
___________________Biology Methods & Protocols---OXFORD UNIV PRESS
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Submitted on: 29 August 2005.
Revised on: 02 November 2005.
Accepted on: 28 November 2005.
___________________Biology Methods & Protocols---OXFORD UNIV PRESS