SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Blood sample testing. Medical technician preparing blood samples for a chemiluminescence immunity test. This test uses fluorescent antibodies to bind to antigens in the blood, allowing the amount of fluorescence to provide a measure of the immune response of the blood. This in turn is used to assess whether the blood is infected. Photographed in June 2006, in Moscow, Russia.
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