1. Laboratory for Optical and Computational Instrumentation, Department of Molecular Biology and Department of Biomedical Engineering, Graduate School, University of Wisconsin at Madison, Madison, WI 53711
2. Glencoe Software, Inc., Seattle, WA 98101
3. Wellcome Trust Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK
4. The Rockefeller University Press, New York, NY 10065