Phagocytic cells involved in phagocytosis of E. coli -the filopodial type is a macrophage and the lamellar type is a monocyte, coloured scanning electron micrograph (SEM). These cells are part of the hematopoietic and reticuloendothelial systems. A macrophage is a large, mature phagocyte that can ingest and destroy invading microbes, foreign particles, cancerous or diseased cells and cellular debris. A monocyte is a circulating phagocyte that ingests microbes, invading particles, and cellular debris. Monocytes mature into macrophages and are both part of the reticuloendothelial system. Monocytes are a type of white blood cell (leukocyte).They are part of the innate immune system of vertebrates. Magnification: x825 when shortest axis printed at 25 millimetres.
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