1. Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, United States
2. Howard Hughes Medical Institute, Chevy Chase, Maryland 20815, United States
3. Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
4. Opti-Mol Consulting, LLC, Cary, North Carolina 27513, United States