title: Ultrastructure of the pulmonary lymphoid tissue.
mesh_terms: D000818:Animals; D001980:Bronchi / Q000166:cytology*; D004847:Epithelial Cells; D006652:Histological Techniques; D008214:Lymphocytes / Q000166:cytology; D008221:Lymphoid Tissue / Q000166:cytology*; D008264:Macrophages / Q000166:cytology; D008297:Male; D008854:Microscopy, Electron; D009000:Monocytes / Q000166:cytology; D051381:Rats