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CD4+ T cell responses are partially blocked by anti-HLA-DR and anti-HLA-DQ antibodies. Consistent with independent reports from other labs, immune responses to ESAT-6 and katG were blocked with monoclonal antibody against HLA-DR. Partial inhibition of immune recognition also was observed with monoclonal antibody against HLA-DQ. HLA-DP did not appear to have a role in ESAT-6 antigen presentation
