1. Department
of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
2. Department
of Structural Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
3. Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia 20147, United States
4. Aix Marseille Université, CNRS, CINaM
UMR 7325, Marseille 13288, France
5. Howard
Hughes Medical Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
6. Departments of Physiology and Biological
Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90095, United States