ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Light micrograph of a section of normal human lymph node. Each lymph node, about the size of a haricot bean, consists of aggregations of lymphatic nodules, seen here separated by connective tissue (blue). Each nodule is a densely packed mass of lymphocytes with nuclei stained purple. The blue-bound region above centre right containing red blood cells, is a blood vessel. The primary function of the lymph nodes is the production of lymphocytes; these may leave the node either via sinuses (white areas), or by passage through the wall of blood vessels. Magnification: x50 at 35mm size.
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