1. Institute of Physical and Theoretical Chemistry, Department of Chemistry, Wrocław University of Technology; 50-370 Wrocław, Poland
2. Leiden Institute of Chemistry, 2300 RA Leiden University; Leiden, The NetherlandsDpt. Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22908, USA
3. Institut de Biologie Structurale, F-38027; Grenoble France