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I: Immunohistochemical staining of DNA polymerase β. Cytoplasmic localization was observed in normal gallbladder (A) and chronic cholecystitis (B); nuclear staining was observed in gallbladder adenocarcinoma (C); D: negative control for immunohistochemistry. II: Correlation between the expression levels of DNA polymerase β and APE1 (total). Pearson correlation r = 0.36, P = 0.02
