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The ability of the CD8+ cells from simian immunodeficiency virus (SIV)-infected rhesus macaques to inhibit SIV replication was investigated. Inhibition was produced by a heat-stable soluble factor of molecular size greater than 10kDa. CD8+ supernatants from some macaques were found not only to suppress SIV growth but also to be cytolytic toward both infected and uninfected CD4+ cells. Such indiscriminate CD8+ cell-mediated cell killing may therefore account for DC4+ cell depletion in certain SIV-infected macaques.
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Blackbourn et al. (1994) studied this question.
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