1. Department of Biology, University of Erlangen-Nuremberg, Staudtstr. 5, D-91058 Erlangen, Germany
2. European Synchrotron Radiation Facility, 71, Avenue des Martyrs, F-38043 Grenoble, France
3. Department Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstr. 3, D-91058 Erlangen, Germany
4. Infoteam, D-91088 Bubenreuth, Germany