Submitted on: 13 May 1998.
Revised on: 22 July 1998.
Accepted on: 13 August 1998.
___________________Epigenetics & Chromatin---BMC
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Submitted on: 14 August 2010.
Revised on: 12 October 2010.
Accepted on: 02 December 2010.
___________________Epigenetics & Chromatin---BMC
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