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Submitted on: 22 March 2004.
Revised on: 30 April 2004.
Accepted on: 09 May 2004.
PLOS BIOLOGY
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Submitted on: 14 February 2007.
Revised on: 06 March 2007.
Accepted on: 17 March 2007.
PLOS BIOLOGY---PUBLIC LIBRARY SCIENCE
Submitted on: 17 January 2013.
Revised on: 01 March 2013.
Accepted on: 09 March 2013.
PLOS BIOLOGY
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