1. University of Wisconsin Department of Biochemistry, , Madison, WI, United States
2. Cryo-Electron Microscopy Research Center , Department of Biochemistry, , Madison, WI, United States
3. University of Wisconsin , Department of Biochemistry, , Madison, WI, United States
4. Midwest Center for Cryo-Electron Tomography , Department of Biochemistry, , Madison, WI, United States
5. University of Georgia Department of Biochemistry and Molecular Biology, , Athens, GA, United States
6. Morgridge Institute for Research , Madison, WI, United States