1. Division of Cell Biology and Experimental Cancer Research (R.C., B.W., J.C.R.), Institute of Pathology, University of Berne, CH-3010 Berne, Switzerland
2. Department of Integrative Biology and Pharmacology (K.A.L., A.S.), University of Texas, Health Science Center-Houston, Houston, Texas 77225
3. Division of Radiological Chemistry (H.R.M.), University Hospital Basel, University of Basel, CH-4003 Basel, Switzerland
4. The Salk Institute for Biological Studies (J.E.R.), La Jolla, California 92037