Affiliation: | 1. Whitehead Institute for Biomedical Research and Department of Biology, Massachusetts Institute of Technology, Suite 401, Nine Cambridge Center, Cambridge, MA 02142, USA;2. Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Boulder, CO 80309, USA;3. Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037, USA |