1. The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute, 10010 North Torrey Pines Road, La Jolla, California, 92037, Neuroscience Research, Novartis Institutes for Biomedical Research, Novartis Pharma AG, Basel, Switzerland, and Division of Cell Biology and Experimental Cancer Research, Institute of Pathology, University of Berne, Berne, Switzerland