Immune system

Immune system

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Caption: Immunity. Artwork of the functioning of the body's immune defences. Invading pathogens like bacteria (upper left, orange) are digested by a white blood cell (dark blue, upper right). Protein antigens (orange spikes) are released and processed by other white blood cells. This process stimulates a B-cell to synthesise Y-shaped antibodies (pink, centre right) specific to the antigens. These are released and bind to the antigens on the bacteria, in a process known as opsonization. In this way the immune system labels the bacteria for engulfment and digestion by phagocytic white blood cells (centre left).

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Keywords: anatomy, antibodies, antibody, antigens, artwork, b-lymphocytes, bacterial, cells, defence, healthy, human body, illustration, immune system, immunoglobulins, immunology, leucocytes, lymphocytes, macrophage, normal, opsonisation, opsonising, phagocyte, phagocytosing, phagocytosis, physiology, protective, synthesis, synthesising, white blood

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