Department of Obstetrics and Gynecology (K.L.P., S.A., J.d.P., J.T., A.R., A.S., B.P., R.L., D.E.), Department of Pediatrics and Naomi Berrie Diabetes Center, Columbia Stem Cell Initiative (A.D.L.A., S.X., N.W., M.V.Z., D.E.), Masters of Biotechnology Program (S.X.), and Department of Genetics and Development, Herbert Irving Comprehensive Cancer Center (A.T., A.C.), Columbia University, New York; Department of Molecular Biology and Genetics, Cornell University, Ithaca (D.J.M., A.K.); and Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York (T.B.), NY