Institution: | (1) Department of Biology, University of Virginia Charlottesville, 22901 Virginia, USA;(2) Present address: Department of Cell and Structural Biology, University of Illinois, 61801 Urbana, Illinois, USA;(3) Present address: Genetics Institute, One Burtt Rd, 01810 Andover, Massachusetts, USA;(4) Department of Cell and Structural Biology, University of Illinois, 61801 Urbana, Illinois, USA |