Acknowledgements
This work was sponsored by the following funding sources: (1) the
Agricultural and Food Research Initiative Competitive Grants Pro-
gram 2010-65108-20536 from the US Department of Agriculture,
(2) the US Army Research Office Grant W911NF0910350, (3) the
US Public Health Service (USPHS) Grant GM59026, and (4) the
Genomic Science Program, US Department of Energy, Office of
Science, Biological and Environmental Research, as part of the
Plant Microbe Interfaces Scientific Focus Area (http://pmi.ornl.
gov). Oak Ridge National Laboratory is managed by UT-Battelle
LLC, for the US Department of Energy under contract DE-AC05-
00OR22725.
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