1. Michael Smith Laboratories University of British Columbia Vancouver British Columbia V6T 1Z4 Canada
2. Department of Botany University of British Columbia Vancouver British Columbia V6T 1Z4 Canada
3. Molecular Biology of Plant‐Microbe Interactions Research Group Albrecht‐von‐Haller‐Institute for Plant Sciences, University of Goettingen D‐37077 Goettingen Germany
4. Biochemistry of Plant‐Microbe Interactions, Dahlem Centre of Plant Sciences Institute of Biology, Freie Universität Berlin 14195 Berlin Germany
5. Department of Molecular Genetics, College of Arts and Sciences Ohio State University Columbus Ohio 43210 USA
6. National Institute of Biological Sciences Beijing 102206 China
7. Department of Plant Cell Biology Albrecht‐von‐Haller‐Institute for Plant Sciences, University of Goettingen D‐37077 Goettingen Germany
8. Central Microscopy Facility of the Faculty of Biology and Psychology University of Goettingen D‐37077 Goettingen Germany