Affiliation: | 1. Department of Genetics, Washington University School of Medicine, St. Louis 4566, Scott Avenue, St. Louis, MO 63110, USA;2. Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 1020 Locust Street, Philadelphia, PA 19107, USA;3. Howard Hughes Medical Institute, Janelia Farm Research Campus (HHMI JFRC), Ashburn, VA, USA |