1. Institute of Physical Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
2. Department of Cellular
and Molecular Biophysics, Max Planck Institute of Biochemistry, Am Klopferspitz
18, D-82152 Martinsried, Germany
3. Institute of Physical Chemistry, University of Goettingen, Tammannstrasse 6, D-37077 Goettingen, Germany