1. Center for the Study of Hepatitis C, Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, New York 10021
2. Department of Medicine II, University of Freiburg, D-79106 Freiburg, Germany
3. Integrated Program in Cellular, Molecular, and Biophysical Studies
4. Howard Hughes Medical Institute, Department of Biochemistry and Biophysics, College of Physicians and Surgeons, Columbia University, New York, New York 10032