title: Tracheobronchial clearance in smoking-discordant twins.
mesh_terms: D000336:Aerosols; D001980:Bronchi / Q000187:drug effects*; D002923:Cilia / Q000187:drug effects*; D005030:Ethylenes; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009092:Mucous Membrane / Q000187:drug effects; D011247:Pregnancy; D012907:Smoking; D013667:Technetium; D013997:Time Factors; D014132:Trachea / Q000187:drug effects*; D014427:Twins
chemical_list: D000336:Aerosols; D005030:Ethylenes; D013667:Technetium