1. Department of Biochemistry, University of Wisconsin , Madison, WI , United States
2. Cryo-Electron Microscopy Research Center, Department of Biochemistry, University of Wisconsin , Madison, WI , United States
3. Midwest Center for Cryo-Electron Tomography, Department of Biochemistry, University of Wisconsin , Madison, WI , United States
4. Departments of Biomolecular Chemistry and Medicine, University of Wisconsin , Madison, WI , United States
5. Collaborative Crystallography Core, University of Wisconsin , Madison, WI , United States
6. Morgridge Institute for Research , Madison, WI , United States
7. DOE Great Lakes Bioenergy Research Center, University of Wisconsin , Madison, WI , United States