1. Department of Metabolic Biochemistry, Neurobiochemistry, Adolf-Butenandt-Institute, Ludwig-Maximilians-University Munich; Munich Germany
2. Institut für Chemie und Biochemie, Freie Universität Berlin; Berlin Germany
3. Department of Cellular Biochemistry, Max Planck Institute of Biochemistry; Martinsried Germany
4. Whitehead Institute for Biomedical Research and HHMI, Department of Biology, MIT; Cambridge MA USA
5. Center for Neuropathology and Prion Research, Ludwig-Maximilians-University Munich; Munich Germany