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Lymphocyte. Coloured transmission electron micrograph (TEM) of a section through a lymphocyte white blood cell. Lymphocytes are involved in the immune system's defence mechanisms, lymph system and antibody production. The nucleus, which contains all the cell's genetic information is green. Mitochondria, which produce energy for the cell, are red. Magnification: x3300 when printed at 10 centimetres wide.
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