1. Laboratory
of Chemical Physics, National Institute of Diabetes and Digestive
and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, United States
2. Physical
Biochemistry, University of Potsdam, 14476 Potsdam, Germany
3. †Department of Biochemistry and #Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
4. National
Institute of Standards and Technology and the Institute for Bioscience
and Biotechnology Research, University of Maryland, Rockville, Maryland 20850, United States