1. From the Departments of Medicine (K.S., J.T., A.T., H.M.D.) and Pathology (R.G.), Microscopy Shared Resource Facility (S.H.), Brookdale Department of Molecular, Cell and Developmental Biology (S.H.), and the Zena and Michael A. Wiener Cardiovascular Institute (K.S., J.T., A.T., H.M.D.), New York, NY.