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(a) Immunohistochemical view (100× magnification) of gastric antral mucosa in a patient with Helicobacter pylori (H pylori)–positive gastritis as a negative control (ie, omitting the primary antibody to heat shock protein [Hsp32]). (b) Immunohistochemical view (100× magnification) of gastric antral mucosa in the same patient with H pylori–positive gastritis stained for Hsp32
