1. Biological
Physics Laboratory, School of Physics and Astronomy, University of Manchester, Oxford Road, Schuster Building, Manchester M13 9PL, U.K.
2. Institute of Laue Langevin, 71
Avenue des Martyrs, CS-20156, 38042 Grenoble, France
3. ISIS
Neutron Facility, STFC, Chilton, Didcot OX11 0QZ, U.K.
4. Centre
for Bioengineering and Biotechnology, China University of Petroleum, Qingdao 266580, China