1. Fitzpatrick Institute for Photonics, Durham, NC 27706, USA
2. Department of Chemistry, Duke University, Durham, NC 27706, USA
3. Department of Biomedical Engineering, Duke University, Durham, NC 27706, USA
4. Department of Biology, Duke University, Durham, NC 27706, USA
5. Bulgarian Academy of Sciences, Institute of Chemical Engineering, Sofia 1113, Bulgaria
6. Biosciences Division, Argonne National Laboratory, Argonne, IL 60439, USA
7. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
8. Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, USA