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One of the penalties of working in a field too long is that more and more of what seems important happened over a decade ago. That was when patterns of AIDS transmission were discerned, human immunodeficiency virus types 1 and 2 (HIV-1 and HIV-2) were discovered, and zidovudine, arguably our most effective antiretroviral drug, was identified. Yet the puzzle of how CD4+ T lymphocytes die in patients with AIDS -- a problem of fundamental importance to the biologic features of HIV and critical to the development of novel therapeutics -- evades our grasp. Basic knowledge of T-cell homeostasis is inchoate
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