1. Department of Internal Medicine (T.I., T.H., L.Z., G.M., K.L.P.), University of Texas Southwestern Medical Center, Dallas, Texas 75390-8857
2. Institute of Molecular Biology (C.-I.P., B.-C.C.) , Academia Sinica, Nankang, Taipei, Taiwan 115, Republic of China
3. Department of Biological Chemistry (N.Y.-O., R.T., J.O.), The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel