Eosinophil white blood cell. Transmission electron micrograph (TEM) of a section through an eosinophil. Eosinophils, like all white blood cells, are part of the body's immune system. They are involved in the body's allergic response and help to defend the body from invading parasites. The cell's cytoplasm contains many characteristic granules (pink) that contain enzymes used to destroy invading organisms. Magnification: x5000 when printed 10 centimetres wide.
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