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PD-L1 expression in the MDA-MB-231 breast cancer cell line measured by flow cytometry. Sample groups: Anti-h 2nd Ab only, the controls engaging with fluorescent goat anti-human secondary antibody only; Ave as 1st Ab, the samples engaging with avelumab as the primary antibody; Df-Ave as 1st Ab, the samples engaging with Df-avelumab as the primary antibody; IgG as 1st Ab, the samples engaging with non-specific IgG as the primary antibody. n=3.
