title: Ultrastructural changes of ciliated columnar epithelium and goblet cells in chronic bronchitis biopsy material.
mesh_terms: D001991:Bronchitis / Q000473:pathology*; D002908:Chronic Disease; D002923:Cilia; D004847:Epithelial Cells; D004848:Epithelium / Q000473:pathology* / Q000648:ultrastructure; D006801:Humans; D007642:Keratosis / Q000473:pathology; D008854:Microscopy, Electron; D008875:Middle Aged