1. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
2. Biophysics Program, School of Medicine, Stanford University, Stanford, California 94305, United States
3. Department of Bioengineering, Stanford University, Stanford, California 94305, United States
4. Division of CryoEM and Bioimaging, SSRL, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
5. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States