1. Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA.
2. Department of Structural Biology, Stanford University School of Medicine, Stanford, CA, USA.
3. Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, USA.
4. Department of Computer Science, Stanford University, Stanford, CA, USA.
5. Institute for Computational and Mathematical Engineering, Stanford University, Stanford, CA, USA.