Institute of Cellular and Molecular Botany, Rheinische Friedrich-Wilhelms-Universitat Bonn, Kirchallee 1, 53115 Bonn, Germany
Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, Fredry 10, 61-701 Poznan and Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, 61-704 Poznan, Poland