School of Engineering and Science, International University Bremen, Campus Ring 1, D-28759 Bremen, Germany, Division of Gene Regulation and Expression, The Wellcome Trust Biocentre, University of Dundee, Dundee DD1 5EH, U.K., and Institut für Biochemie, FB 8, Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany (At 2005-06-18)
