1. Skaggs
School of Pharmacy and Pharmaceutical Sciences, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093-0934, United States
2. Department
of Chemistry, University of Texas at Austin, 105 East 24th Street, A5300, Austin, Texas 78712-1224, United States
3. School
of Medicine, University of Texas Medical Branch, 301 University
Boulevard, Galveston, Texas 77555, United States
4. Clayton
Foundation Laboratories for Peptide Biology, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037-1002, United States
5. Division
of Endocrinology, Diabetes, Metabolism, Department of Medicine, Beth
Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, United States