1. Department of Biology, University of Washington, Seattle, Washington 98195
2. Department of Botany and Plant Sciences, Institute for Integrative Genome Biology, University of California, Riverside, California 92521
3. Center for Ecological Research, Kyoto University, Otsu, Shiga 520-2113 Japan
4. Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, Washington 98195