1. Medical
Microbiology, Institute for Infection and Immunity, St George’s, University of London, Cranmer Terrace, London SW17 ORE, U.K.
2. Institut Laue Langevin, 71 avenue
des Martyrs, 38042 Grenoble, France
3. Institute
of Pharmaceutical Science, King’s College London, Franklin
Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K.