1. Laboratory of Genomic Diversity, Basic Research Program, SAIC Frederick, National Cancer Institute, Frederick, Maryland 21702, USA
2. National Cancer Institute–Frederick, Frederick, Maryland 21702, USA
3. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA
4. White Oak Conservation Center, Yulee, Florida 32097, USA
5. Present address: U.S. Food and Drug Administration, College Park, Maryland 20740, USA
6. Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota 55108, USA
7. Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado 80523, USA