1. Departments of Molecular Physiology and Biophysics (K.A.B., K.E.S., J.K.O., O.P.M., R.M.O.) Vanderbilt University School of Medicine, Nashville, Tennessee 37232
2. Department of Nutritional Sciences and Toxicology (R.A.L., J.-C.W.), University of California at Berkeley, Berkeley, California 94720
3. Medicine (C.D.), Vanderbilt University School of Medicine, Nashville, Tennessee 37232