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Submitted on: 07 November 2012.
Revised on: 04 December 2012.
Accepted on: 27 December 2012.
NUCLEIC ACIDS RESEARCH---OXFORD UNIV PRESS
Submitted on: 14 January 2010.
Revised on: 30 January 2010.
Accepted on: 11 February 2010.
NUCLEIC ACIDS RESEARCH