1. Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, United States
2. Program in Molecular Biophysics, Johns Hopkins University, Baltimore, Maryland 21218, United States
3. Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
4. Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, United States
5. Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, United States