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Immunolocalization of CFTR in 4-day-old prelarvae (D4), transverse sections: (A,C,E) SW-acclimated fish, (B,D,F) FW-acclimated fish. (A) Crypt staining of ionocytes (I) on the roof of the branchial cavity (BC). (B) No staining in the branchial cavity. (C) Diffuse staining in intestinal cells. (D) Apical staining on the brush border of the intestine enterocytes. (E) Weak diffuse staining in the collecting ducts. (F) No staining.
