SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Donor heart. Coloured angiogram (arterial X-ray) of the coronary arteries of a donor heart removed for transplantation. A radio-opaque dye has been injected into the arteries by a catheter (black, running from top left to top centre). The dye makes the arteries visible on the X-ray, allowing their health to be assessed. This procedure, known as bench angiography, is only necessary as the donor is more than 55 years old.
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