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Immunolocalization of CFTR in 1-day-old prelarvae (D1), transverse sections: (A,B,B′) anterior section; (C) posterior section. (A) Integumental ionocytes (TI) present an apical immunofluorescence around the branchial slits (BS). (B,B′) Apical staining in integumental ionocytes (TI) and on the yolk-sac (YS) membrane. (C) No staining of the renal ducts (RD). (—): no fluorescence; (→): fluorescence.
