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Immunohistological demonstration of H. pylori. (A) Clusters of immunolabeled organisms at the surface of pyloric mucosa of a patient infected with Helicobacter pylori, immunohistochemical staining for H. pylori (primary antibody: Bo471 DAKO, Denmark), hematoxylin counterstain, positive control reaction; (B) negative control reaction. Bar line = 10 µm
