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A macrophage of a mouse forming two processes to phagocytize two smaller particles, possibly pathogens. Source: Wikimedia Commons
A macrophage is a type of large leukocyte (white blood cell) that uses a process called phagocytosis to engulf bacteria and digest cellular debris. Macrophages develop from monocytes and, during inflammation, are able to produce inflammatory molecules.

Macrophages are found mainly in the liver, spleen, and lymph nodes. Working together with other lymphocytes, they form part of the body's immune system.

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