1. Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. Department of Biochemistry, Brandeis University, Waltham, Massachusetts 02453, United States
4. Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, United States