1. From the Mary and Garry Weston Molecular Immunology Laboratory, Thrombosis Research Institute, London, UK (X.L., M.X., D.C., V.V.K.); Department of Medical Microbiology and Immunobiology, University of Szeged, Szeged, Hungary (V.E., I.F.); Virology, National Center for Epidemiology, Budapest, Hungary (E.G.); MRC Centre for Transplantation, King’s College London, London, UK (D.C.); and the Thrombosis Research Institute, Bangalore, India (L.M., V.V.K.).