1. Center
for Biological Physics, Arizona State University, P.O. Box 871504, Tempe, Arizona 85287, United States
2. Department
of Chemistry, Yeshiva University, 500 West 185th St., New York, New York, 10033, United States
3. Center
for Biological Physics, Arizona State University, P.O. Box 871504, Tempe, Arizona 85287-1504, United States