Submitted on: 09 February 2000.
Revised on: 27 May 2000.
Accepted on: 19 July 2000.
___________________BIOSCIENCE---OXFORD UNIV PRESS
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Submitted on: 14 March 2021.
Revised on: 14 May 2021.
Accepted on: 27 June 2021.
___________________BIOSCIENCE---OXFORD UNIV PRESS
Submitted on: 14 July 2004.
Revised on: 06 November 2004.
Accepted on: 24 December 2004.
___________________BIOSCIENCE---OXFORD UNIV PRESS
Submitted on: 19 January 2010.
Revised on: 08 February 2010.
Accepted on: 14 March 2010.
___________________BIOSCIENCE---OXFORD UNIV PRESS
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