1. From the Division of Cardiovascular Sciences (J.C., R.M., J.H.), Laboratory of Thrombosis and Haemostasis, Center for Applied Medical Research (CIMA), University of Navarra, Pamplona, Spain; Research Centre (F.E.), Hospital Universitario La Fe, Valencia, Spain; The Howard Hughes Medical Institute (C.T.E.), Oklahoma Medical Research Foundation, Oklahoma City, OK.