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New Zealand Researchers Makes 'Natural Born Killer' Cell Discovery. 1  Aug. 31, 2017 â An unexpected role for a white blood cell called the Natural Killer (NK) cell -- a critical cell for ridding the body of infection and cancer, has been discovered. The NK cell is a ...
Macrophages The macrophage is one of the most important cells of the immune system. For many years it has been known as the main phagocyte of the immune system. Macrophages eat and destroy pathogens, such as bacteria, viruses and fungi, thus they are a critical part of the body's defense against microorganisms.acrophages are produced in the bone marrow, where red blood cells, platelets and granulocytes are made. In the bone marrow, macrophage precursor cells are called promonocytes. Promonocytes eventually mature and migrate into the blood, where they are called monocytes. Monocytes are only found in the blood.