1. From the Center for Immunology and Inflammatory Diseases (E.A.H., E.L., A.M.T., Q.Y., A.Y.L., N.A., K.J., A.D.L., R.E.G.), Cardiovascular Research Center (E.A.H., E.L., A.Y.L., N.A., R.E.G.), and Center for Molecular Imaging Research (V.M.L., E.A.), Massachusetts General Hospital, Charlestown, Mass, and Harvard Medical School, Boston, Mass; and Lipid Metabolism Unit & Endocrine Division (S.L.K., K.J.M.), Massachusetts General Hospital, Boston, Mass, and Harvard Medical School, Boston, Mass.