BACKGROUND : Alveolar macrophages play a key role in the initiation of the inflammatory reaction of allergic asthma .
background : alveolar macrophages play a key role in the initiation of the inflammatory reaction of allergic asthma .
O O B-cell_type I-cell_type O O O O O O O O O B-other_name I-other_name O B-other_name I-other_name O