Mast cells in airway smooth muscle.
D001249:Asthma / Q000276:immunology*; D001980:Bronchi / Q000276:immunology*; D006801:Humans; D008407:Mast Cells; D009130:Muscle, Smooth / Q000276:immunology*; D029424:Pulmonary Disease, Chronic Obstructive / Q000276:immunology*; D012907:Smoking / Q000276:immunology*