1. Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, 1315 Kinnear Rd., Columbus, OH 43212, USA
2. Department of Biological Sciences, University of Idaho, Box 443051, Moscow, ID 83844-3051, USA
3. Iridian Genomes, Inc., 6213 Swords Way, Bethesda, MD 20817, USA