1. Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 USA
2. Department of Biophysics and Biophysical Chemistry Johns Hopkins University Baltimore MD 21205 USA
3. Department of Chemical Engineering University of Michigan Ann Arbor MI 48109 USA
4. Department of Biomedical Engineering University of Michigan Ann Arbor MI 48109 USA
5. Cellular and Molecular Biology Program University of Michigan Ann Arbor MI 48109 USA
6. Department of Biophysics University of Michigan Ann Arbor MI 48109 USA
7. Department of Biology Johns Hopkins University Baltimore MD 21205 USA
8. Department of Biomedical Engineering Johns Hopkins University Baltimore MD 21205 USA
9. Howard Hughes Medical Institute Baltimore MD 21205 USA