1. Department of Pharmacology, La Jolla, CA 92093-0647, USA
2. Medical Scientist Training Program, La Jolla, CA 92093-0606, USA
3. Howard Hughes Medical Institute and University of California at San Diego, La Jolla, CA 92093-0647, USA
4. Department of Pathology, La Jolla, CA 92093-0647, USA
5. Department of Surgery, La Jolla, CA 92093-0647, USA
6. Department of Radiology, La Jolla, CA 92093-0647, USA