Fig. 8.

Histochemical and immunocytochemical characterization of cells present in the secretory tubules in albino TH wild-type and TH null mice at P21. Myoepithelial cells (arrows) were identified by their immunoreactivity for smooth muscle actin. Secretory cells (arrows) were identified using a polyclonal antiserum that recognizes aquaporin 5 and a histochemical assay for the Na⁺-K⁺ ATPase. The specificity of the ATPase reaction is determined by its sensitivity to ouabain. No differences were evident in the expression of the three markers when wild-type and TH null sweat glands were compared. Scale bar, 20 μm.