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Immunohistochemical staining for MUC5B protein (brown) in cystic structures in idiopathic pulmonary fibrosis (IPF) lung. Left: An area of IPF lung tissue containing histologically normal airway and honeycomb cysts. Middle and right: Honeycomb cysts, exclusively. In all three panels, honeycomb cysts are filled with mucus. Tissue was counterstained with hematoxylin.
