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Helicobacter pylori (H. pylori) upregulates the expression of TLR9 in MKN45 cells. MKN45 cells were stimulated with H. pylori for 12 h at a bacterium-to-cell ratio of 150:1, and the expression of TLR9 was detected using Western blot (a) and qRT-PCR (b). **P < 0.01, compared with controls
