1. Departments of Internal Medicine and Human Genetics, University of Michigan Medical School, Ann Arbor, MI 48109.
2. Laboratoire de Génétique Moleculaire des Tumeurs, Institut Curie, 75231 Pans, Cedex 05, France.
3. Laboratoire de Structure et Mutagenese Chromosomiques, Institut Curie, Paris, France.
4. Department of Colorectal Surgery, Cleveland Clinic, Fort Lauderdale, FL 33309.
5. Surgical Developmental Oncology, Roswell Park Memorial Institute, Buffalo, NY 14263.