1. Department of Chemistry, University at Buffalo, Buffalo, New York 14260, United
States
2. Department of Biochemistry
and
Biocenter Oulu, University of Oulu, P.O.
Box 3000, FIN-90014 Oulu, Finland
3. Department of Chemistry and Department
of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520, United States