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Macrophages

The relatively long-lived Phagocytic Cell of mammalian Tissues that are derived from Blood Monocytes. Main types are Peritoneal Macrophages; Alveolar Macrophages; Histiocytes; Kupffer Cells of the liver; and Osteoclasts. They may further differentiate within chronic inflammatory lesions to Epithelioid Cells or may fuse to form Foreign Body Giant Cells or Langhans Giant Cells. (from The Dictionary of Cell Biology, Lackie and Dow, 3rd ed.)