Submitted on: 14 June 2003.
Revised on: 15 August 2003.
Accepted on: 09 September 2003.
___________________International Journal of Stem Cells
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Submitted on: 28 September 1999.
Revised on: 09 November 1999.
Accepted on: 03 December 1999.
___________________International Journal of Stem Cells
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Submitted on: 08 February 2004.
Revised on: 18 March 2004.
Accepted on: 12 May 2004.
___________________International Journal of Stem Cells
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