1. Department
of Molecular Enzymology, Institute of Biochemistry and Biology, University of Potsdam, 14476 Potsdam, Germany
2. Department
of Biochemistry, University of California, Riverside, California 92521, United States
3. Department
of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, United States
4. Institute
of Experimental Physics, Free University Berlin, 14195 Berlin, Germany