1. Single Molecule Analysis Group, Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
2. Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
3. Michigan Society of Fellows, University of Michigan, Ann Arbor, Michigan 48109, United States
4. Single Molecule Analysis in Real-Time (SMART) Center, University of Michigan, Ann Arbor, Michigan 48109, United States
5. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
6. Department of Biomedical Engineering, Emory University and the Georgia Institute of Technology, Atlanta, Georgia, 30322
7. Center for RNA Biomedicine, University of Michigan, Ann Arbor, Michigan 48109, United States