1. Materials Science and Engineering Program; University of California San Diego; 9500 Gilman Drive La Jolla CA 92093 USA
2. Division of Physical Biology and Bioimaging Center; Shanghai Synchrotron Radiation Facility; CAS Key Laboratory of Interfacial Physics and Technology; Shanghai Institute of Applied Physics; Chinese Academy of Sciences; University of Chinese Academy of Sciences; Shanghai 201800 China
3. Department of Physics and Astronomy; University of Pennsylvania; Philadelphia PA 19104 USA
4. Department of Mechanical and Aerospace Engineering; University of California San Diego; 9500 Gilman Drive La Jolla CA 92093 USA
5. Department of Electrical and Computer Engineering; University of California San Diego; 9500 Gilman Drive La Jolla CA 92093 USA
6. NMR Based Structural Biology; Max Planck Institute for Biophysical Chemistry; Am Fassberg 11 37077 Göttingen Germany
7. School of Life Science; Inner Mongolia Agricultural University; 306 Zhaowuda Road Hohhot 010018 China
8. Institute of Engineering in Medicine; University of California San Diego; 9500 Gilman Drive La Jolla CA 92093 USA
9. Department of Bioengineering; University of California San Diego; 9500 Gilman Drive La Jolla CA 92093 USA