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- The alveolar macrophage is derived largely from the bone marrow .
- Antibodies were used in the macrophage system to inhibit cathepsin d .
- The innate resistance thought to be related to the activity of macrophages .
- The alveolar macrophage is particularly rich in the variety of proteolytic enzymes .
- At any time the macrophage system might be injured by viral infection or air pollutant exposure .
- a large phagocyte; some are fixed and other circulate in the blood stream