has part has part has_part characteristic of has modifier alveolar macrophage abnormal alveolar macrophage number decreased alveolar macrophage number MP:0014229 alveolar macrophage hypoplasia reduction in the number of round, granular, mononuclear phagocytes found in the alveoli of the lungs which ingest small inhaled particles resulting in degradation and presentation of the antigen to immunocompetent cells reduced alveolar macrophage number abnormal decreased amount