1. European Molecular Biology Laboratory, Structural and Computational Biology Unit, Meyerhofstrasse 1, 69117 Heidelberg, Germany.
2. Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
3. Département de Biochimie, Université de Lausanne, 1066 Epalinges, Switzerland.
4. Physikalische Chemie 1, Ruhr-Universität Bochum, 44780 Bochum, Germany.
5. Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.