1. Departments of Biochemistry and Molecular Biology (A.B., H.-W.S., S.S., M.F.W.), The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030;
2. Surgical Oncology (A.B.), The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030;
3. School of Medicine (H.-W.S., M.B., K.D.G., M.F.W.), Department of Reproductive Medicine, University of California, San Diego, La Jolla, California 92093-0695;
4. Department of Molecular Cell Biology (S.K., F.C.), Katholieke Universiteit Leuven, BE-3000 Leuven, Belgium;
5. Leukemia (R.C., J.P.I.), The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030;
6. Center for Reproductive Biology Research (K.S., M.-C.O.-C.), Vanderbilt School of Medicine, Nashville, Tennessee 37232-2358