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Submitted on: 18 September 2000.
Revised on: 31 October 2000.
Accepted on: 14 December 2000.
___________________IEEE-ACM Transactions on Computational Biology and Bioinformatics
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Submitted on: 25 August 1998.
Revised on: 22 October 1998.
Accepted on: 01 November 1998.
___________________IEEE-ACM Transactions on Computational Biology and Bioinformatics
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