1. From the Department of Biochemistry and Biomedical Sciences (C.A.K.), McMaster University, Hamilton, ON, Canada; the Department of Medicine (N.V. and P.L.G.), McMaster University, Hamilton, ON, Canada; and the Thrombosis and Atherosclerosis Research Institute (N.V., P.L.G.), Hamilton, ON, Canada. Dr Kretz is now with the Life Sciences Institute, University of Michigan, Ann Arbor, Michigan.