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Submitted on: 06 June 1999.
Revised on: 18 September 1999.
Accepted on: 19 October 1999.
___________________Acta Crystallographica Section F-Structural Biology Communications
Submitted on: 15 June 2008.
Revised on: 13 September 2008.
Accepted on: 28 October 2008.
___________________Acta Crystallographica Section F-Structural Biology Communications
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Submitted on: 01 May 2011.
Revised on: 02 August 2011.
Accepted on: 07 September 2011.
___________________Acta Crystallographica Section F-Structural Biology Communications