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      "value" : "The human T-lymphoid cell line, CEM, was transfected with gp 160 cDNA of human immunodeficiency virus type 1 (HIV-1)pm213. Three clones expressing the envelope glycoproteins (env), designated CEM-213env1, -env4, and -env7, were isolated. These clones expressed high levels of surface gp41 and gp120, as demonstrated by flow cytometry with anti-HIV env monoclonal antibodies. Processing and function of env was shown by induction of syncytia with CD4-expressing HeLa cells and by immunoblot analysis. The env expression resulted in specific down-regulation of surface CD4 levels, supporting the role of HIV env in CD4 modulation. Furthermore, serum samples from nine of nine HIV-1-infected individuals bound specifically to the env-expressing transfectants, substantiating the presence of conserved antigenic determinants. These sera also mediated antibody-dependent cellular cytotoxicity (ADCC) of the env-expressing cell lines. The env-expressing cell lines provide a relevant, safe, and practical model for qualitative and quantitative analysis of humoral and cellular immune responses and their role in HIV-1 pathogenesis and therapy.",
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