1. Research and Development Service (K.N.F., E.M.F.), Edward Hines, Jr. Veterans Affairs Hospital, Hines, Illinois 60141
2. Neuroscience Institute (K.N.F.), Loyola University Chicago—Stritch School of Medicine, Maywood, Illinois 60153
3. Department of Otolaryngology—Head and Neck Surgery (E.M.F.), Loyola University Chicago—Stritch School of Medicine, Maywood, Illinois 60153
4. Department of Anatomy and Cell Biology (K.J.J.), Indiana University School of Medicine, Indianapolis, Indiana 46202
5. Richard L. Roudebush Veterans Affairs Medical Center (K.J.J.), Indianapolis, Indiana 46202