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Expression levels of IL-21R and PD-L1 in A549 cells following treatment with IL-21. The protein expression levels of (A) IL-21R and (B) PD-L1 were measured by western blot analysis. **P<0.01 and ***P<0.001 vs. control. IL, interleukin; R, receptor; PD-L1, programmed death 1 ligand 1.
