1. From the Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN (DD, ADC, CAD, and MCM); INRA, Unité de Nutrition Humaine, UMR1019, Saint Genès Champanelle, France (DD and DR); and the Department of Cellular and Molecular Physiology, Penn State University College of Medicine, Hershey, PA (SRK and LSJ)