Melissa Chiasson1, Douglas M Fowler2,3,4. 1. Department of Genome Sciences, University of Washington, Seattle, WA, USA. 2. Department of Genome Sciences, University of Washington, Seattle, WA, USA. dfowler@uw.edu. 3. Department of Bioengineering, University of Washington, Seattle, WA, USA. dfowler@uw.edu. 4. Genetic Networks Program, CIFAR, Toronto, Ontario, Canada. dfowler@uw.edu.