1. University of Tennessee–Oak Ridge National Laboratory Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, TN 37996, USA.
2. National Science Foundation, 2415 Eisenhower Avenue, Alexandria, VA 22314, USA.
3. Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA.
4. Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.