1. From the Max-Planck-Institute for Physiological and Clinical Research (F.P., M.H., K.I, T.Z., S.M., B.F., W.S., M.C.), Bad Nauheim, Germany; the German Research Centre for Biotechnology (J.v.d.H., H.W.), Braunschweig, Germany; School of Pharmacy, Faculty of Medicine (G.G.), The Hebrew University of Jerusalem, Jerusalem, Israel; and the Center for Transgene Technology and Gene Therapy (P.C.), Leuven, Belgium.