1. Department of Biology, The Johns Hopkins University, Baltimore, Maryland
2. Department of Biology, Stanford University School of Medicine, Stanford, California
3. Section on Light and Circadian Rhythms (SLCR), National Institute of Mental Health, National Institute of Health, Bethesda, MD 20892.
4. The Solomon Snyder-Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland
5. Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, California
6. Howard Hughes Medical, Institute, Stanford University School of Medicine, Stanford, California
7. Department of Neuroscience, University of Connecticut Health Center, Farmington, Connecticut