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Submitted on: 30 December 1999.
Revised on: 12 January 2000.
Accepted on: 28 January 2000.
TRENDS IN CELL BIOLOGY
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http://reply.papertrans.cn/3/300/29923/29923-34.png
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Submitted on: 03 March 2002.
Revised on: 05 April 2002.
Accepted on: 20 April 2002.
TRENDS IN CELL BIOLOGY---CELL PRESS