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Immunohistochemical staining of pendrin and MUC5AC in the nasal mucosa in the ECRS (B and C) and non-ECRS groups (E and F; original magnification, ×400). An abundant eosinophilic infiltration was shown in the ECRS group (A, arrow). Pendrin staining was intense in the ECRS (B) but absent in the non-ECRS (E) groups. MUC5AC expression was widely observed in the ECRS (C) compared to the non-ECRS (F) groups.
