[1] Ohio State Univ, Dept Mol Virol Immunol & Med Genet, Ctr Comprehens Canc, Columbus, OH 43210 USA
[2] Ohio State Univ, Mol Cellular & Dev Biol Program, Columbus, OH 43210 USA
[3] Inst Pasteur, INSERM, U579, Nucl Org & Oncogenesis Unit, F-75724 Paris 15, France