1. Biological Sciences, Louisiana State University, 202 Life Sciences, Baton Rouge, LA 70803, USA.
2. Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA.
3. Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA.
4. Biotechnology Laboratory, Department of Ion-beam-applied Biology, Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan.
5. Laboratoire de Génétique Moléculaire Evolutive et Médicale, INSERM U 571-2ème étage, Faculté de Médecine Necker-Enfants Malades Université René, Descartes-Paris V, 75730 Paris Cedex 15, France.
6. Institut de Génétique et Microbiologie, Université Paris Sud, Bâtiment 409, 91405 Orsay Cedex, France.