1. Program in Immunology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
2. Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
3. Department of Biophysics, University of Michigan, Ann Arbor, MI 48109, USA.
4. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
5. Cape Town HVTN Immunology Laboratory, Hutchinson Centre Research Institute of South Africa, NPC (HCRISA), Cape Town 8001, South Africa.
6. Department of Medicine, University of Washington School of Medicine, Seattle, WA 98195, USA.