Submitted on: 02 May 2002.
Revised on: 24 August 2002.
Accepted on: 19 October 2002.
___________________Cytology and Genetics---PLEIADES PUBLISHING INC
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Submitted on: 16 February 2000.
Revised on: 24 March 2000.
Accepted on: 10 May 2000.
___________________Cytology and Genetics---PLEIADES PUBLISHING INC