1. Department of Plant Biochemistry, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
2. Department of Microbial Genetics, University of Tübingen, Tübingen, Germany
3. Proteome Center Tübingen, University of Tübingen, Tübingen, Germany
4. Medical and Natural Sciences Research Centre, University of Tübingen, Tübingen, Germany
5. Wallon Centre for Industrial Biology, University of Liege-Gembloux Agro-Bio Tech, Gembloux, Belgium