1. Roon Research Center for Arteriosclerosis and Thrombosis, Division of Blood Cell and Vascular Biology, Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, U.S.A.
2. Division of Vascular Biology, Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037, U.S.A.