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Programmed death ligand 1 (PD-L1) expression status of breast cancer cells: (A) Cell surface PD-L1 and (B) an average of the fold change of median fluorescence intensity (MFI). (C) PD-L1 mRNA expression and (D) PD-L1 protein expression. Each value is the mean ± SD of three independent experiments. Statistical significance ** p < 0.01.
