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Extracellular human immunodeficiency virus-1 (HIV-1) Tat protein and Tat-derived peptides are biologically active but mechanisms of Tat processing are not known. Within the highly conserved basic region of HIV-1 Tat protein (amino acids, a.a. 48-56), we identified two putative furin cleavage sites and showed that Tat protein was cleaved in vitro at the second site, RQRR↓ (a.a. 53-56↓). This in vitro...
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