1. From the Department of Cell Biology and Physiology (W.X., E.S.W., S.L.H., K.B., K.M.C.), The University of North Carolina, Chapel Hill
2. Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Italy (L.S.)
3. McAllister Heart Institute (K.B.), The University of North Carolina, Chapel Hill
4. Lineberger Comprehensive Cancer Center, Chapel Hill, NC (K.B.).
5. Department of Genetics (K.M.C.), The University of North Carolina, Chapel Hill