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[ccp4bb]: protein topology diagram, references for DNA and sugar conformation



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I have two questions,

1) which program is used to plot the protein's topology diagram and where
I can get it.

2) anybody can point out some reference papers or good textbooks regarding
the DNA and sugar conformation? I am analyzing the structure of a DNA
molecule and need to understand some technical terms like "shear"
"stretch" "stagger" "C2'-endo" etc.

Many thanks.  

regards,
Q. Steven Xu
Dept. of Physiology and Biophysics
Boston Univ. School of Medicine
Tel: (617)638-4083
Fax: (617)638-4041
E-mail: qianxu@bu.edu