1. Biophysics Program, Stanford University School of Medicine, Stanford, CA 94305
2. Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305
3. School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853
4. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025
5. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025
6. Department of Chemistry, New York University, New York, NY 10003
7. Department of Electrical Engineering, Stanford University, Stanford, CA 94305