1. Department
of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
2. Biomedical
Engineering and Physical Science Shared Resource, National Institute
of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, Maryland 20892, United States
3. Department of Chemistry
and Chemical Biology, Cornell University, Northeastern Collaborative
Access Team, Argonne National Laboratory, Argonne, Illinois 60439, United States
4. Biophysics Collaborative
Access Team, Advanced Photon Source, 9700 South Cass Avenue, Bldg. 435B, Argonne, Illinois 60439, United States
5. Dynamics
of Macromolecular Assembly Section, Laboratory of Cellular Imaging
and Macromolecular Biophysics, National Institute of Biomedical Imaging
and Bioengineering, National Institutes of Health, Bethesda, Maryland 20892, United States