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Aortic repair. Coloured scanning electron micrograph (SEM) of the wall of the ascending aorta, 6 years after a stent graft (not seen) was inserted in order to repair a weak area in the aorta's wall (an aneurysm). Over time, endothelial (lining) tissue (red) has grown over the fabric mesh of the stent, obscuring it from view. Magnification: x830 when printed 10 centimetres wide.
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