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Comparison of baseline PDL1 expression under normoxia and hypoxia. The expression of PDL1 on the tumor cell surface was detected by flow cytometry. The MFI of each tumor cell line under normoxia and hypoxia is shown in the histogram. Results are presented as mean ± s.d. Each experiment was repeated at least three times. Statistical significance of the difference between cells under normoxia and hypoxia are indicated by asterisks. *p < 0.05, ***p < 0.001.
