1. Department of Physics, King′s College London, London WC2R 2LS, U.K.
2. Randall Centre for Cell and Molecular Biophysics, Faculty of Life Sciences and Medicine, King’s College London, London SE1 1UL, U.K.
3. Department of Cell and Developmental Biology, University College London, Gower Street, London WC1E 6BT, U.K.
4. Department of Pharmaceutical Technology and Biopharmaceutics, University of Vienna, Universitätsring 1, 1010 Vienna, Austria