1. Programme in Cell Biology (L.J., A.R., X.H., A.K.), The Hospital for Sick Children, Toronto, Ontario, Canada M5G 1X8
2. Department of Biochemistry (L.J.), Ontario, Canada M5S 1A8
3. Institute of Medical Science (C.D.C.-O., A.K.), University of Toronto, Ontario, Canada M5S 1A8
4. Department of Surgery (C.D.C.-O., A.K.), Toronto General Hospital, Ontario, Canada M5G 2C4