1. Bio-/Medical Informatics Department, Bielefeld University, D-33615 Bielefeld, Germany
2. Physik-Department, Technische Universität München, D-85748 Garching, Germany
3. Organic Chemistry Department, University of Paderborn, D-33098 Paderborn, Germany
4. Department of Plant Biochemistry and Physiology, Bielefeld University, D-33615 Bielefeld, Germany