Figure 3

Immunohistochemistry BK2 receptor. Section of rat duodenal wall showing immunoreactivity for the BK2 receptor (a). Staining is more marked in the crypt epithelium than in the villus epithelium. At higher magnification of the villus (b) immunoreactivity can be localised to the basal part of the cytoplasm in the absorptive cells. In the crypts of Lieberkühn (c) immunstaining is somewhat stronger and present in most epithelial cells. Immunoreactivity is also seen in the Auerbach nerve plexus (arrow) of the muscle layers. Negative control (d). Bar = 100 μm.