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Monocytes and Macrophages

Monocytes and macrophages are white blood cells that serve two purposes in the immune system: First, they are both phagocytes, which means they can engulf and destroy disease-causing microorganisms and dead cells in the body. Second, they are both antigen-presenting cells; that is, they interact with lymphocytes, which in turn triggers an impressive cellular and humoral response to an offending microorganism.