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Validation of the expression patterns of five signature genes. (A) The gene mRNA expressions of five signature genes in the normal and tumor tissues. (B) Five signature genes expression in normal and LUAD cell lines. (C) Immunohistochemistry of the ERO1L, KRT18, GALNT2, PPIA in the normal and tumor groups from the HPA database. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001.
