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POLA2 significantly correlated with infiltrating immune cell markers and immune checkpoints in HCC. The significantly POLA2 co-expressed immune cell markers; (B-D) GO and KEGG functional enrichment of POLA2-associated immune cell markers by Metascape; (E-L) POLA2 immune checkpoint correlation analysis. (M) Western blot results for PD-L1 in HepG2 and SMMC-7721 cells and the relative protein expression level change of PD-L1
