1. Department of Physics, Syracuse University, 201 Physics Building, Syracuse, New York 13244-1130, United States
2. Structural Biology, Biochemistry, and Biophysics Program, Syracuse University, 111 College Place, Syracuse, New York 13244-4100, United States
3. Department of Chemistry, University of Massachusetts, 820 LGRT, 710 North Pleasant Street, Amherst, Massachusetts 01003-9336, United States
4. Department of Biomedical and Chemical Engineering, Syracuse University, 223 Link Hall, Syracuse, New York 13244, United States