Submitted on: 05 December 2012.
Revised on: 19 February 2013.
Accepted on: 14 April 2013.
___________________American Journal of Stem Cells
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Submitted on: 25 April 2010.
Revised on: 17 August 2010.
Accepted on: 14 September 2010.
___________________American Journal of Stem Cells
Submitted on: 14 May 2003.
Revised on: 15 July 2003.
Accepted on: 28 August 2003.
___________________American Journal of Stem Cells
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Submitted on: 15 March 1999.
Revised on: 29 May 1999.
Accepted on: 10 June 1999.
___________________American Journal of Stem Cells