1. School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen,
Germany
2. Center for Biophysics
and Computational
Biology and Beckman Institute, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801,
United States
3. Department
of Physics, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States