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Fibrinogen molecule, illustration
Molecular model showing the structure of the blood clotting glycoprotein fibrinogen (factor I). The molecule consists of two sets of alpha, beta and gamma chains joined at a central nodule. Fibrinogen, which is synthesised by the liver, is converted by thrombin into fibrin during a cascade of complex reactions initiated by chemicals released by cells at injury sites., Photo by MEDICAL GRAPHICS/MICHAEL HOFFMANN/SCIENCE PHOTO LIBRARY
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