title: Airway epithelium releases a relaxant factor: demonstration with substance P.
mesh_terms: D000818:Animals; D004848:Epithelium / Q000378:metabolism; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009124:Muscle Proteins / Q000378:metabolism*; D009569:Nitric Oxide; D013373:Substance P / Q000494:pharmacology*; D014132:Trachea / Q000187:drug effects / Q000378:metabolism*
chemical_list: D009124:Muscle Proteins; D009569:Nitric Oxide; D013373:Substance P