1. From the Departments of Medicine (Section of Cardiology) and Pharmacology (K.O., V.S., H.W.K., G.-F.C., T.K., R.D.M., T.F.) and Department of Pharmacology (R.D.M., M.U.-F.), Center for Cardiovascular Research, Center for Lung and Vascular Biology, University of Illinois at Chicago, Chicago, IL; Jesse Brown VA Medical Center, Chicago, IL (T.K., R.D.M., T.F.); Biosciences Division (L.F.) and X-Ray Science Division (L.F., S.V.), Argonne National Laboratory, Argonne, IL.