1. Molecular Imaging Program at Stanford, Stanford University, 299 Campus Drive, Stanford, California 94305, USA
2. Bio-X Program, Stanford University, 299 Campus Drive, Stanford, California 94305, USA
3. Biophysics Program, Stanford University, 299 Campus Drive, Stanford, California 94305, USA
4. Department of Structural Biology, Stanford University, 299 Campus Drive, Stanford, California 94305, USA
5. Department of Electrical Engineering, Stanford University, 299 Campus Drive, Stanford, California 94305, USA