1. Department of Biological Chemistry (Z.G., N.M.-B., S.E., A.B., S.B., J.O.), The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel;
2. Department of Molecular Genetics and Biotechnology (O.K., A.B.O.), The Hebrew University-Hadassah Medical School, Jerusalem, Israel;
3. Department of Biochemistry and Molecular Biology (B.L., C.K.S.), University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark, New Jersey 07103;
4. Laboratory of Cell Biology (M.R.M.), National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892