1. Departments of Surgery (G.W., W.W., X.Q., M.R.H., E.W.E., G.H.G.), The University of Texas Medical Branch, Galveston, Texas 77555
2. Department of Physiology (Y.A.), University of Toronto, Toronto, Ontario, Canada M5S 1A1
3. Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (A.-M.O.), University of Bristol, Bristol, United Kingdom BS8 1TH
4. Shizuoka Cancer Center Hospital and Research Institute (T.M.), Shizuoka 420-0853, Japan
5. Human Biological Chemistry and Genetics (H.-Q.W.), The University of Texas Medical Branch, Galveston, Texas 77555