1. From the Departments of Plasma Proteins (M.G.R., R.B., A.K., K.A.G., E.S., J.A.v.M., J.V.) and Molecular Cell Biology (M.F-B.), Sanquin Research and Landsteiner Laboratory, and the Department of Vascular Medicine (J.A.v.M.), Academic Medical Centre, University of Amsterdam, The Netherlands.