1. From the Albert Ludwigs University Freiburg (I.R.B., H.-J.B.), Research Group for Experimental and Clinical Arteriogenesis, Department of Cardiology and Angiology, Freiburg im Breisgau, Germany, and Max-Planck-Institute for Neurological Research (H.-J.B., G.M., K.-A.H.), Department for Experimental Neurology, Cologne, Germany.