1. Department
of Biochemistry, University of California, Riverside California 92521, United States
2. Physical
Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Department
of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma 74078, United States
4. Research
School of Biology, The Australian National University, Canberra, Australian Capital Territory 0200, Australia