1. Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana, USA
2. U.S. Department of Energy Joint Genome Institute, Walnut Creek, California, USA
3. Architecture et Fonction des Macromolécules Biologiques, Centre National de la Recherche Scientifique & Aix-Marseille University, Marseille, France
4. Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon, USA