Affiliation: | From the ‡Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, 40225 Düsseldorf.;the §Institute of Biochemistry, Medical Faculty, Christian-Albrechts-University, 24118 Kiel.;the ¶Institute of Molecular Biotechnology, RWTH Aachen University, 52062 Aachen, and ;‖CONARIS Research Institute AG, 24118 Kiel, Germany |