1. Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA
2. Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
3. Department of Biology, Texas A&M University, College Station, TX 77843, USA
4. Department of Entomology, Texas A&M University, College Station, TX 77843, USA
5. Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA