1. Optical
Spectroscopy Section, Laboratory of Molecular Biophysics, National
Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, United States
2. Department of Chemistry & Biochemistry, Montana State University, Bozeman, Montana 59717, United States
3. Department
of Chemistry, Saint Francis University, Loretto, Pennsylvania 15940, United States
4. Department
of Biophysical Chemistry, Groningen Biomolecular Science and Biotechnology
Institute, University of Groningen, Groningen, The Netherlands
5. Department
of Biology, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States