1. Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
2. Department of Bioengineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
3. Center for Biophysics and Quantitative Biology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States