The secretin receptor and CFTR is present in pendrin-positive cells in the cortex of WT mice. (A) Immunohistochemical localization of pendrin (red, upper panel), the SCTR (green, middle panel), and double staining (lower panel) in the cortex of WT mice. (B) Immunohistochemical localization of pendrin (red, upper panel), CFTR (green, middle panel), and double staining (lower panel) in the cortex of WT mice. (C) Higher magnification of the indicated area in (B) showing apical colocalization of CFTR and pendrin in the apical membrane. DAPI, 4′,6-diamidino-2-phenylindole.