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T-lymphocyte and iron particles, SEM

T-lymphocyte and iron particles, SEM

C022/6258

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Credit

STEFAN DILLER / SCIENCE PHOTO LIBRARY STEFAN DILLER / SCIENCE PHOTO LIBRARY

Caption

T-lymphocyte and iron particles, coloured scanning electron micrograph (SEM). The T-lymphocyte (or T-cell) is at centre. It is a type of white blood cell that is an important part of the body's immune system. It tracks down and destroys foreign bodies and infected cells. It also helps to mediate the production of antibodies against invading organisms, such as bacteria and viruses. T-lymphocytes originate in the bone marrow, but mature in the thymus gland. The round objects are iron particles (5 micrometres across) used to separate the T-cells from other blood cells. Magnification: x4200 when printed at 10 centimetres across.

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