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Comparison of effects of S- and Re-forms of LPS on IFN-γ production by NK cells. (A) Re-form of LPS (lipid A) does not alter significantly IFN-γ production in NK cells at the same concentration as the S-form (full-length LPS; 5 μg/ml). Data from one of four experiments with similar results are presented. (B) Significant increase of IFN-γ secretion is induced by low dose of lipid A (10 ng/ml) in NK cell preparation containing a fraction of HLA-DRbright blood DCs (donor B, Figure 3).
