1. Center for Biological Physics, Department of Physics, Arizona State University, Tempe, Arizona 85287, United States
2. Massachusetts General Hospital, Boston, Massachusetts 02114, United States
3. Department of Cellular and Molecular Pharmacology, University of California, San Francisco, California 94158, United States
4. Department of Mathematics, University of Tennessee, Knoxville, Tennessee 37996, United States
5. School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States