1. Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA
2. Department of Microbiology and Immunology, University of Michigan Medical School, 1150 West Medical Center Drive, 5641 Medical Science II, Ann Arbor, MI 48109, USA
3. Johns Hopkins University, Department of Biology, 3400 North Charles Street, Baltimore, MD 21218, USA
4. University of Michigan Medical School, Department of Urology, 1500 East Medical Center Drive, Ann Arbor, MI 48109, USA
5. Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201, USA