1. Molecular Biophysics, Division of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NN U.K., Unilever Research and Development, Port Sunlight, Wirral CH63 3JW U.K., and Institute of Pharmaceutical Innovation, University of Bradford, Bradford, W. Yorkshire, BD1 7DP U.K.