50.8 MB (3.6 MB compressed)
5089 x 3487 pixels
43.2 x 29.5 cm ⏐ 17.0 x 11.6 in (300dpi)
BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Lymph node. Light micrograph of a section through a lymph node, part of the immune system. The node contains T- and B-lymphocytes, white blood cells which can travel to sites of infection within the body. Lymph fluid flows through the nodes, and has micro-organisms filtered from it by phagocyte white blood cells. The rounded structures seen in the node are lymphoid follicles. The paler centres of the follicles are germinal centres, sites of B- lymphocyte proliferation. B-lymphocytes produce antibodies to fight infections. Magnification: x4 at 35m size.
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