1. Department of Medicine, Stanford University School of Medicine, Stanford, California
2. Liver Diseases Section, NIDDK, NIH, Bethesda, Maryland
3. Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California
4. Howard Hughes Medical Institute, Los Angeles, California
5. BD Biosciences, San Jose, California
6. Department of Genetics, Stanford University School of Medicine, Stanford, California
7. Department of Medicine, University of California, San Francisco, California
8. Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California and Howard Hughes Medical Institute, Los Angeles, California
9. Departments of Medicine and Microbiology and Immunology, Stanford University School of Medicine, Stanford, California