1. Department of Genome Sciences, University of Washington , Seattle, WA 98195, USA
2. Program in Biology, Loras College , Dubuque, IA 52001, USA
3. Westridge School , Pasadena, CA 91105, USA
4. Department of Fisheries and Wildlife, Michigan State University , East Lansing, MI 48824, USA
5. Department of Biological Sciences, University of Idaho , Moscow, ID 83844, USA
6. UW Molecular and Cellular Biology Program, University of Washington , Seattle, WA 98195, USA
7. Present address: Department of Genetics, Stanford University, Biomedical Innovations Building, Palo Alto , CA 94304, USA