1. Departments of Molecular and Cellular Physiology and Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.
2. Howard Hughes Medical Institute, Stanford, CA 94305, USA.
3. Howard Hughes Medical Institute, Baltimore, MD 21205, USA.
4. Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
5. Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
6. Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794, USA.
7. Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
8. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
9. Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA.