1. Department of Biological Science, Florida State University Tallahassee
Florida 32306–1100 USA; E-mail: steppan@bio.fsu.edu
2. Department of Pediatrics and Center of Genomics and Bioinformatics, University of Tennessee Health Science Center Memphis
Tennessee 38103 USA; E-mail: radkins1@utmem.edu
3. Department of Genetics, Southwest Foundation for Biomedical Research
San Antonio Texas 78245–0549 USA