1. Laboratory of Physical Chemistry, Eidgenössische Technische Hochschule (ETH) Zürich, Wolfgang-Paulistrasse 10, CH-8093 Zürich, Switzerland.
2. Clayton Foundation Laboratories for Peptide Biology, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
3. Howard Hughes Medical Institute, UCLA-DOE Institute for Genomics and Proteomics, Box 951570, University of California, Los Angeles, CA 90095, USA.
4. Institute of Cell Biology, Department of Biology, ETH Zürich, 8093 Zürich, Switzerland.
5. Department of Neuroscience, University of California, San Diego, La Jolla, CA 92093, USA.
6. Division of Endocrinology, Diabetes and Metabolism, Tufts Medical Center, Boston, MA 02111, USA.
7. Department of Chemistry, IFM, Linköping University, SE-581 83 Linköping, Sweden.
8. Cellular Neurobiology Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
9. Structural Biology, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.