1. From the Center for Molecular and Vascular Biology, Laboratory of Morphology and Molecular Pathology, and Laboratory for Thrombosis Research, Interdisciplinary Research Center, Campus Kortrijk, University of Leuven, Belgium; Department of Pathology, Harvard Medical School, Boston, MA; INSERM, U 553; Institut de Formation et de Recherche (IFR) 105, Institut d'Hématologie; and Université Paris VII Denis Diderot, Paris, France.