1. University of California, Irvine; Department of Biological Chemistry; 825 Health Sciences Road, 240D Med Sci I Irvine CA 92697 USA
2. Southern Illinois University School of Medicine; Department of Biochemistry and Molecular Biology; 1245 Lincoln Drive, Neckers Building Carbondale IL 62901 USA
3. University of California, School of Medicine; Department of Medicine; 1450 3rd Street, HD-340 San Francisco CA 94158 USA