http://reply.papertrans.cn/3/287/28674/28674-31.png
Submitted on: 20 December 2002.
Revised on: 19 January 2003.
Accepted on: 05 February 2003.
STEM CELLS
http://reply.papertrans.cn/3/287/28674/28674-33.png
http://reply.papertrans.cn/3/287/28674/28674-34.png
http://reply.papertrans.cn/3/287/28674/28674-35.png
http://reply.papertrans.cn/3/287/28674/28674-36.png