1. R. J. Thresher, Y. Miyamoto, A. Kazantsev, D. S. Hsu, C. Petit, C. P. Selby, L. Dawut, A. Sancar, Department of Biochemistry and Biophysics, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA. M. H. Vitaterna and J. S. Takahashi, National Science Foundation Center for Biological Timing, Howard Hughes Medical Institute and Department of Neurobiology and Physiology, Northwestern University, Evanston, IL 60208, USA. O. Smithies, Department of Pathology and Laboratory Medicine,...