1. Department of Cell Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
2. Genomics Institute of the Novartis Research Foundation, 3115 Merryfield Row, La Jolla, CA 92121, USA.
3. Center for Biomathematical Technology, NSF Center for Biological Timing, Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Virginia, Charlottesville, VA 22904, USA.
4. Novartis Agricultural Discovery Institute, 3115 Merryfield Row, San Diego, CA 92121, USA.