1. From the Departments of Ophthalmology and Visual Sciences and 2Cell and Developmental Biology, University of Michigan School of Medicine, Ann Arbor, Michigan;
2. the Department of Anatomy and Cell Biology, Wayne State University School of Medicine, Detroit, Michigan;
3. the Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland; and
4. the Department of Biological Sciences and the 6Center for Zebrafish Research, University of Notre Dame, Notre Dame, Indiana.