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Submitted on: 08 March 2003.
Revised on: 03 April 2003.
Accepted on: 01 June 2003.
___________________Cold Spring Harbor Molecular Case Studies
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Submitted on: 16 June 2017.
Revised on: 01 September 2017.
Accepted on: 17 September 2017.
___________________Cold Spring Harbor Molecular Case Studies
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