1. Department of Biological Sciences (S.U., X.L., R.E.P.), University of Alberta, Edmonton, Alberta T6G 2E9, Canada
2. Clayton Foundation Laboratories for Peptide Biology (L.C., J.R.), The Salk Institute for Biological Studies, La Jolla, California, 92037-1099
3. Department of Biochemistry (H.K., K.K.), National Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan