1. Department of Plant Biochemistry, Georg-August-University of Goettingen, Albrecht-von-Haller-Institute for Plant Sciences, D-37077 Goettingen, Germany
2. Max-Planck-Institute of Molecular Plant Physiology, Metabolic Networks, D-14424 Potsdam, Germany
3. University of Potsdam, Institute of Biochemistry and Biology, 14469 Potsdam, Germany
4. Max-Planck-Institute of Experimental Medicine, Proteomics Group, D-37075 Goettingen, Germany
5. Deutsche Forschungsgemeinschaft Research Center for Molecular Physiology of the Brain, D-37073 Goettingen, Germany