1. Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Centre, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki FI-00014, Finland
2. Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway
3. Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku FI-20520, Finland
4. Protein Mass Spectrometry Group, Max-Planck Institute for Plant Breeding Research, D-50829 Cologne, Germany
5. Department of Biochemistry and Molecular Biology, Saitama University, Saitama 338-8570, Japan
6. Department of Botany, University of Wisconsin, Madison, WI 53593, USA