Submitted on: 27 July 2003.
Revised on: 23 November 2003.
Accepted on: 29 December 2003.
___________________AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY
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Submitted on: 24 April 2000.
Revised on: 21 May 2000.
Accepted on: 14 July 2000.
___________________AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY
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Submitted on: 25 January 1999.
Revised on: 01 March 1999.
Accepted on: 15 March 1999.
___________________AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY