1. Vaccine Research Center and Yerkes Regional Primate Research Center, Emory University, Atlanta, GA 30329, USA.
2. Vaccine Research Center and Department of Microbiology and Immunology of Emory University School of Medicine, Atlanta, GA 30322, USA.
3. Vaccine Research Center and Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA.
4. Vaccine Research Center and Department of Medicine, Division of Infectious Diseases of Emory University School of Medicine, Atlanta, GA 30322, USA.
5. Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA.
6. Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
7. Division of AIDS, STD and TB Laboratory Research, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30330, USA.