1. Synapse Group and
2. Max-Planck/CNRS Group, UPR 2396, Centre de Neurochimie, F-67084 Strasbourg, France.
3. Institute for Cell Biochemistry and Clinical Neurobiology, University of Hamburg, D-20246 Hamburg, Germany.
4. Protein Chemistry Group, Max-Delbrück-Center for Molecular Medicine, D-13092 Berlin, Germany.