1. Division of Basic Sciences, New York University College of Dentistry, New York, NY 10010
2. Institut de Biochimie et Génétique Cellulaires/Centre National de la Recherche Scientifique, F-33077 Bordeaux, France
3. Departments of Pathology and Medicine, Harvard Medical School, Dana-Farber Cancer Institute, Howard Hughes Medical Institute, Boston, MA 02115
4. Serono Pharmaceutical Research Institute, Serono International S.A., CH-1228 Plan-les Ouates, Geneva, Switzerland
5. Wadsworth Center, New York State Department of Health, Albany, NY 12203