1. From the Department of Cardiac Surgery (W.R., A.W.) and the Department of Cardiology (K.T.), University of Bonn, Bonn, Germany; the Institute of Neurophysiology (Z.J.L., Y.X., J.H., B.K.F.), Institute of Anatomy I (W.B., E.S., K.A.), and Institute of Vegetative Physiology (S.S., R.S., G.P.), University of Cologne, and Axiogenesis AG (H.B., E.K.), Cologne, Germany; and the Department of Biotechnology in Animal Production, Tulln, Austria (M.F., G.B).