1. From the Departments of Ophthalmology and Visual Sciences and
2. Mary D. Allen Laboratory for Vision Research, Doheny Eye Institute, and4Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, California.
3. From the Departments of Ophthalmology and Visual Sciences and5Human Genetics, the W. K. Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan; the