1. Centre for Bioengineering and Biotechnology, China University of Petroleum (East China), 66 Changjiang West Road, Qingdao 266555, China
2. Biological Physics Laboratory, School of Physics and Astronomy, University of Manchester, Schuster Building, Manchester M13 9PL, United Kingdom
3. ISIS Neutron Facility, Rutherford Appleton Laboratory, Science and Technology Facilities Council, Chilton, Didcot, Oxfordshire OX11 0QZ, United Kingdom