1. Department of Cell Biology, Heidelberg Institute for Plant Sciences, University of Heidelberg, 69120 Heidelberg, Germany
2. Department of Developmental Biology, Heidelberg Institute for Plant Sciences, University of Heidelberg, 69120 Heidelberg, Germany
3. Microscopy Unit, Center for Plant Molecular Biology, University of Tübingen, 72076 Tübingen, Germany
4. Laboratory of Biochemistry, Wageningen University, 6703 HA Wageningen, The Netherlands
5. Developmental Genetics, Center for Plant Molecular Biology, University of Tübingen, 72076 Tübingen, Germany
6. Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland
7. Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan