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Submitted on: 25 February 2000.
Revised on: 09 June 2000.
Accepted on: 16 July 2000.
___________________Cold Spring Harbor Perspectives in Biology
Submitted on: 26 March 2008.
Revised on: 16 June 2008.
Accepted on: 04 August 2008.
___________________Cold Spring Harbor Perspectives in Biology
Submitted on: 24 May 2015.
Revised on: 20 September 2015.
Accepted on: 11 November 2015.
___________________Cold Spring Harbor Perspectives in Biology
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Submitted on: 31 December 2001.
Revised on: 27 March 2002.
Accepted on: 15 April 2002.
___________________Cold Spring Harbor Perspectives in Biology