http://reply.papertrans.cn/3/228/22771/22771-31.png
http://reply.papertrans.cn/3/228/22771/22771-32.png
http://reply.papertrans.cn/3/228/22771/22771-33.png
Submitted on: 12 September 2012.
Revised on: 26 October 2012.
Accepted on: 03 November 2012.
NATURE STRUCTURAL & MOLECULAR BIOLOGY
http://reply.papertrans.cn/3/228/22771/22771-35.png
Submitted on: 01 February 1999.
Revised on: 24 February 1999.
Accepted on: 14 March 1999.
NATURE STRUCTURAL & MOLECULAR BIOLOGY