1. School of Biological Sciences
2. University of Essex
3. Colchester, UK
4. Chimie Biologique Structurale
5. Institut de Chimie
6. Université de Liège
7. 4000 Liège, Belgium
8. The Henry Wellcome Laboratories of Structural Biology
9. Department of Biochemistry
10. University of Leicester
11. Leicester LE1 9HN, UK