http://www.cryst.bbk.ac.uk/PPS2/assignments/week9.html
John Walshaw j.walshaw@mail.cryst.bbk.ac.uk BioMOO: JohnW
or pps2@mail.cryst.bbk.ac.uk
Principles of Protein Structure Using the Internet
Crystallography Department, Birkbeck College, University of London
Malet Street, London WC1E 7HX