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Immunolocalization of CFTR in juveniles (130 mm), transverse sections: (A,A′,C,E,G) SW-acclimated fish, (B,D,F,H) FW-acclimated fish. (A,A’) Crypt staining in ionocytes (I) of the gill filaments (F). (B) No staining in the gills. (C,D) No staining in the urinary ducts (UD). (E) Basal staining in the posterior intestine (PI). (F) Apical staining of the brush border in the posterior intestine. (G,H) Apical staining in the rectum (R).
