1. Sunnybrook and Women's College Health Sciences Centre, Molecular and Cellular Biology Research, Room S-218, 2075 Bayview Avenue, Toronto, Ontario, Canada M4N 3M5.
2. Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada M5S 1A1.
3. Hamilton Civic Hospitals Research Centre, McMaster University, Hamilton, Ontario, Canada L8V 1C3.
4. Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
5. ImClone Systems, Inc., 180 Varick Street, 7th Floor, New York, NY 10014, USA.