1. Department of Biological Sciences, University of Maryland, Baltimore, Maryland 21250
2. Department of Biological Science, Florida State University, Tallahassee, Florida 32306
3. Bioinformatics Research Center and Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695, and
4. High Performance Biological Computing Group Roy J. Carver Biotechnology Center University of Illinois at Urbana-Champaign, Urbana, IL 61801