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Microvilli and cilia in CRSwNP samples (scanning electron microscopy): (A,B)—microvilli with normal appearance; (C)—microvilli partially covered with mucus; (D)—mucus-embedded microvilli; (E)—cilia with normal appearance, mainly oriented in the same direction; (F)—ciliary disorientation, goblet cells area (N—neutrophil, GC—goblet cell).
