Submitted on: 03 December 2011.
Revised on: 25 December 2011.
Accepted on: 14 February 2012.
___________________BIOCHEMICAL JOURNAL---PORTLAND PRESS LTD
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Submitted on: 27 March 2000.
Revised on: 11 June 2000.
Accepted on: 08 August 2000.
___________________BIOCHEMICAL JOURNAL---PORTLAND PRESS LTD