1. Structural Chemistry Section, Chemistry Department, University of Manchester, Oxford Road, Manchester M13 9PL, UK
2. Department of Biophysics, The Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BZ, UK
3. NASA, Laboratory for Structural Biology, Code ES76, Building 4464, MSFC, Huntsville, AL 35812, USA
4. Institute of Biophysics, Academia Sinica, Beijing 100101, China
5. Dornier GmbH, Raumfahrt-Infrastruktur, 88039 Friedrichshafen, Germany
6. NSLS, Brookhaven National Laboratory, Upton, NY 11973, USA
7. ESRF, BP 220, 38043 Grenoble Cedex, France
8. Laboratoire de Cristallographie Macromoleculaire, Institut de Biologie Structurale, 41 Avenue des Martyrs, 38027 Grenoble Cedex, France
9. EMBL, Ave. des Martyrs, 38043 Grenoble Cedex, France
10. Biochemistry Department, Royal Holloway and Bedford New College, University of London, Egham, Surrey TW20 0EX, UK