1. Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, MD, USA.
2. Department of Biology, Johns Hopkins University, Baltimore, MD, USA.
3. Department of Biophysics, Johns Hopkins University, Baltimore, MD, USA.
4. Laboratory of Biochemistry and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA.
5. Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA.
6. Howard Hughes Medical Institute, Baltimore, MD, USA.
7. Department of Molecular Biology and Genetics, Johns Hopkins School of Medicine, Baltimore, MD, USA.