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Immunohistochemistry of H pylori associated gastritis showed an increase in the relative intensity of staining of the proliferative zone of the epithelium with cyclooxygenase (COX)-1 (A) and COX-2 (B) antibodies. There was also an increase in the number of cells of the lamina propria which stained positively with COX-1 (A) and COX-2 (B) antibodies.
