1. Biozentrum der Universität Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland.
2. Department of Molecular Genetics and Microbiology, Duke University Medical Center, Research Drive, Durham, NC 27710, USA.
3. Syngenta Biotechnology Inc., 3054 Cornwallis Road, Research Triangle Park, NC 27709, USA.
4. Departments of Agronomy and Biological Sciences, Clemson University, Clemson, SC 29634, USA.