macrophage NIFSTD:sao185843373 A mononuclear phagocyte which differentiates from monocytes, is typically resident in a particular tissue, and capable of phagocytosing a variety of extracellular particulate material, including immune complexes, microorganisms, and dead cells (Cell Ontology). SNOMEDCT:58986001 NCIt:C12558 A mononuclear phagocyte present in variety of tissues, typically differentiated from monocytes, capable of phagocytosing a variety of extracellular particulate material, including immune complexes, microorganisms, and dead cells. Relatively long-lived phagocytic cell of mammalian tissues, derived from blood monocyte. Macrophages from different sites have distinctly different properties. Main types are peritoneal and alveolar macrophages, tissue macrophages (histiocytes), Kuppfer cells of the liver, and osteoclasts. In response to foreign materials may become stimulated or activated. Macrophages play an important role in killing of some bacteria, protozoa, and tumour cells, release substances that stimulate other cells of the immune system, and are involved in antigen presentation. May further differentiate within chronic inflammatory lesions to epithelioid cells or may fuse to form foreign body giant cells or Langhans' giant cells. Tomasz Adamusiak James Malone myeloid leukocyte cell type