Affiliation: | 1. Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA;2. Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA;3. Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02154, USA;4. Department of Genetics, Development and Physiology, Cornell University, Ithaca, NY, USA;5. Department of Microbiology, University of Chicago, 920 E. 58th Street, Chicago, IL 60637, U.S.A. |