Airways smooth muscle.
D000818:Animals; D001249:Asthma / Q000503:physiopathology*; D004285:Dogs; D006168:Guinea Pigs; D006736:Horses; D006801:Humans; D009130:Muscle, Smooth / Q000503:physiopathology*; D012137:Respiratory System / Q000503:physiopathology*; D013552:Swine