1. Department of Biology, University College London, Gower Street, London WC1E 6BT, United Kingdom; Department of Physics, University of Strathclyde, 107 Rottenrow East, Glasgow G4 0NG, Scotland, United Kingdom; Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom; Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, United States; and School of Biological...