1. Department
of Cellular Biophysics, Max Planck Institute for Medical Research, Jahnstraße 29, 69120 Heidelberg, Germany
2. Institute
of Physical Chemistry, University of Heidelberg, 69117 Heidelberg, Germany
3. BioSystems & Micromechanics IRG, Singapore-MIT Alliance in Research and Technology, Singapore
4. Department
of Mechanical Sciences and Engineering, University of Illinois at Urbana−Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States