Submitted on: 09 October 1998.
Revised on: 15 November 1998.
Accepted on: 13 January 1999.
___________________Bioengineered---TAYLOR & FRANCIS INC
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Submitted on: 11 November 2000.
Revised on: 22 January 2001.
Accepted on: 15 March 2001.
___________________Bioengineered---TAYLOR & FRANCIS INC
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