1. Laboratory of Hepatitis and Related Emerging Agents, Division of Emerging and Transfusion-Transmitted Diseases, Office of Blood Research and Review, CBER, FDA, 8800 Rockville Pike, HFM310, Bethesda, Maryland 20892
2. Department of Cell Biology and Molecular Genetics, Microbiology Building, Room 2135, University of Maryland, College Park, Maryland 20742