1. Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States
2. Pacific Northwest National Laboratory, Richland, Washington 99352, United States
3. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
4. Institute of Biological Chemistry, Washington State University, Pullman, Washington 99163, United States
5. Department of Chemistry and Department of Physics, Duke University, Durham, North Carolina 27708, United States
6. Department of Biochemistry, Duke University, Durham, North Carolina 27710, United States
7. Department of Biological Sciences, Marquette University, Milwaukee, Wisconsin 53201, United States
8. Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061, United States