1. Department of Pathology; University of Pittsburgh; Pittsburgh Pennsylvania
2. Department of Neurobiology, Pharmacology & Physiology; University of Chicago; Chicago Illinois
3. Departments of Pathology and of Microbiology, Immunology & Cell Biology; West Virginia University School of Medicine; Morgantown West Virginia
4. Department of Cell Biology; Washington University; Saint Louis Missouri
5. Veteran's Affairs Medical Center; Pittsburgh Pennsylvania