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The inducible expression of PD‐L1 in human lung cancer cell lines determined by flow cytometry. Each cell line was cultured in a 24‐well plate. IFN‐γ (100 ng/mL) or TNF‐α (50 ng/mL) or TNF‐β (10 ng/mL) or IL‐2 (100 U/mL) was added per well, respectively and cultured for 72 hours.
