1. Department of Physics, University of Helsinki, FI-00560 Helsinki, Finland
2. J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, CZ-18223 Prague, Czech Republic
3. National Heart and Lung Institute, Imperial College London, Sir Alexander Fleming Building, London SW7 2AZ, U.K.
4. NIHR Imperial Biomedical Research Centre, London SW7 2AZ, U.K.
5. Institute of Biotechnology, University of Helsinki, FI-00790 Helsinki, Finland
6. Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, CZ-16100 Prague 6, Czech Republic