1. Department of Chemistry, Wesleyan University, Middletown, Connecticut 06459, United States
2. Department of Chemistry & Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
3. Bioinformatics and Computational Biology Program, University of Minnesota, Minneapolis, Minnesota 55455, United States
4. Department of Integrative Biology and Physiology, Medical School, University of Minnesota, Minneapolis, Minnesota 55455, United States