1. Department
of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut 06269-3125, United States
2. Department
of Molecular Biology and Biophysics, UConn Health, Farmington, Connecticut 06030-3305, United States
3. Laboratory
of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland