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Expression of HLA-DR was analyzed in different cell samples. Freshly isolated NK cells were stained with fluorochrome-labeled antibodies CD56-APC and HLA-DR-FITC and analyzed by flow cytometry. Donor A: one of typical NK cell preparations with very small amount of HLA-DRbright blood DC cells. Donor B: NK cell preparation containing a fraction of HLA-DRbright blood DC cells.
