title: Secretory activity of normal middle ear epithelium. Scanning and transmission electron microscopic observations.
mesh_terms: D004432:Ear, Middle / Q000166:cytology / Q000378:metabolism*; D004847:Epithelial Cells; D004848:Epithelium / Q000378:metabolism; D005064:Eustachian Tube / Q000166:cytology / Q000378:metabolism*; D006801:Humans; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning