1. Department of Biological Sciences, University of Toledo, Toledo, OH 43606
2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109
3. Department of Physics and Astronomy, University of Toledo, Toledo, OH 43606
4. Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109
5. Department of Biophysics, University of Michigan, Ann Arbor, MI 48109
6. Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI 48109