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Effect of NK cells on the expression of MHC molecules on BEC. BEC were co-cultured with or without activated NK cells for 24 hours at an NK/BEC ratio of 0.5. Levels of cell surface HLA-ABC, -E and HLA-DR were assessed by flow cytometry. A. Representative FACS plots. B. Mean fluorescence intensity (MFI) of staining for MHC molecules on BECs with (+) or without (−) pre-incubation with NK cells.
