Expression of Cl-2, Cl-5 and Cl-11 in brain microvessels in control (CON), AD and VaD brains, in the frontal cortex, Brodmann area 46/9. Cl-expressing cells are brownish, as a result of the immunohistochemical staining method with anti-Cl sera detected with avidin–biotin-peroxidase complex kit and DAB substrate. Endothelial cells expressing Cl-2, Cl-5 or Cl-11 are indicated by arrows. Bars: 5 μm.