1. From the Department of Medicine (K.M.P., A.S., J.T., J.B., J.M., D.J.R.) and Department of Genetics (D.J.R.), Perelman School of Medicine at the University of Pennsylvania, Philadelphia; Section of Experimental Atherosclerosis, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD (X.J., H.K.); and Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada (C.R.M.).