1. Department of Physiology and Biophysics and the Massey Cancer Center, Virginia Commonwealth University, Richmond, Virginia 23298, United States
2. National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899, United States
3. Scientific Computing Department, Science and Technology Facilities Council Daresbury Laboratory, Warrington, Cheshire WA4 4AD, United Kingdom
4. Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, Florida 33199, United States