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Submitted on: 17 June 2002.
Revised on: 23 August 2002.
Accepted on: 11 October 2002.
___________________CYTOLOGIA---UNIV TOKYO CYTOLOGIA
Submitted on: 11 May 2004.
Revised on: 14 July 2004.
Accepted on: 25 July 2004.
___________________CYTOLOGIA---UNIV TOKYO CYTOLOGIA