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Submitted on: 17 September 1999.
Revised on: 13 December 1999.
Accepted on: 26 January 2000.
___________________CURRENT OPINION IN STRUCTURAL BIOLOGY
Submitted on: 10 January 2004.
Revised on: 24 February 2004.
Accepted on: 27 March 2004.
___________________CURRENT OPINION IN STRUCTURAL BIOLOGY
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