ACKNOWLEDGMENTS
The work conducted by the U.S. Department of Energy Joint Genome Institute is supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. Additional support was provided by NSF grant no. MCB-0546865 and EPS-9977809. We are also grateful for support from Greg Fullmer through the University of Nevada Las Vegas (UNLV) Foundation.