CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Liver artery. Coloured scanning electron micrograph (SEM) of the interior of an artery in the liver. Lymphocytes (white blood cells, red) are adhering to the arterial wall. The liver contains a large population of lymphocytes, which are needed to protect the liver from its constant exposure to antigens from the gut. These antigens enter the liver through the portal vein. Magnification: x1120 at 10 centimetres wide.
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