1. Department
of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455,
United States
2. Department
of Molecular Biophysics
and Biochemistry, Yale University, New
Haven, Connecticut 06520, United States
3. Douglass College, Rutgers University, New Brunswick, New Jersey 08901,
United States
4. Department
of Physics, Carnegie Mellon University,
Pittsburgh, Pennsylvania
15213, United States