Submitted on: 06 June 2013.
Revised on: 17 August 2013.
Accepted on: 02 October 2013.
___________________Current Opinion in Physiology---ELSEVIER
Submitted on: 22 May 2001.
Revised on: 04 August 2001.
Accepted on: 01 September 2001.
___________________Current Opinion in Physiology---ELSEVIER
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Submitted on: 14 February 2012.
Revised on: 22 March 2012.
Accepted on: 16 May 2012.
___________________Current Opinion in Physiology---ELSEVIER
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