Department of Genome Sciences, University of Washington, Box 357710, Seattle, Washington 98195, USA. cfong@u.washington.edu|Department of Genome Sciences, University of Washington, Box 357710, Seattle, Washington 98195, USA. cfong@u.washington.edu|Department of Genome Sciences, University of Washington, Box 357710, Seattle, Washington 98195, USA. cfong@u.washington.edu|Department of Genome Sciences, University of Washington, Box 357710, Seattle, Washington 98195, USA. cfong@u.washington.edu|Department of Genome Sciences, University of Washington, Box 357710, Seattle, Washington 98195, USA. cfong@u.washington.edu