Immunohistochemical staining of the hydrogen potassium ATPase present in gastric parietal cells.

<p>(A) Moderate numbers of parietal (brown) cells are still present in the proximal antrum of uninfected Mongolian gerbils. Original magnification: 100×. (B) An abrupt loss of parietal cells is seen in the transition zone between fundus and antrum in Mongolian gerbils infected with <i>H. suis</i> for 9 weeks. Original magnification: 100×.