1. Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125
2. Department of Anesthesiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095
3. Broad Institute, Cambridge, MA 02142
4. Howard Hughes Medical Institute, Massachusetts General Hospital, Boston, MA 02115
5. Integrated Imaging Center, Department of Biology, Johns Hopkins University, Baltimore, MD 21218