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Submitted on: 15 April 2016.
Revised on: 09 May 2016.
Accepted on: 29 May 2016.
___________________JOURNAL OF STRUCTURAL BIOLOGY---ACADEMIC PRESS INC ELSEVIER SCIENCE
Submitted on: 26 September 1999.
Revised on: 19 October 1999.
Accepted on: 24 November 1999.
___________________JOURNAL OF STRUCTURAL BIOLOGY---ACADEMIC PRESS INC ELSEVIER SCIENCE
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