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CFTR is expressed in pig sinus epithelia. (A) Reverse-transcriptase polymerase chain reaction of sinus epithelia with primers for CFTR (155 bp) and β-actin control. (B) Immunohistochemistry of sinus epithelia staining for CFTR protein in airway epithelia of CFTR+/+ pigs. (C) Absence of staining in CFTR−/− pig airway epithelia. Bars: 8 μm.
