STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Lymph node. Coloured light micrograph of a section through a lymph node. A lymph node filters pathogens from lymph fluid, a watery liquid that surrounds the tissues of the body. The germinal centre of the node (blue) houses B lymphocytes (a type of white blood cell) and antibodies, which play important roles in the immune system. Magnification: x250 when printed at 10 centimetres across.
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