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Submitted on: 08 October 1999.
Revised on: 29 January 2000.
Accepted on: 19 March 2000.
___________________JOURNAL OF PHYSIOLOGY AND BIOCHEMISTRY
Submitted on: 11 June 2000.
Revised on: 08 September 2000.
Accepted on: 10 October 2000.
___________________JOURNAL OF PHYSIOLOGY AND BIOCHEMISTRY