1. Department
of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States
2. Departments
of Chemistry and Molecular Biosciences, Northwestern University, Evanston, Illinois 60208, United States
3. Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
4. Department
of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States