White blood cells, illustration

Bildnummer 14233449
White blood cells, illustration
Illustration of three types of white blood cell: a macrophage (purple), dendritic cells (blue) and t helper cells (red). Macrophages mainly function to engulf and destroy substances which provoke an immune response. This process is known as phagocytosis. Dendritic cells' primary function is presenting antigens, which are molecules which the immune system recognises as foreign. T helper cells are involved in chemically signalling other immune cells and coordinating the immune response.
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Credit: Science Photo Library / DESIGN CELLS
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