1. School of Integrative Plant Science, Plant Pathology and Plant Microbe-Biology, Cornell University, Ithaca, New York 14853, USA;
2. Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14853, USA
3. School of Biology and Environmental Science and Earth Institute, University College Dublin, Dublin, Ireland
4. US Department of Energy Joint Genome Institute, Walnut Creek, California 94598, USA
5. Graduate Field of Microbiology, Cornell University, Ithaca, New York 14853, USA
6. Department of Life Sciences & Systems Biology, University of Torino, 10125 Torino, Italy