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Heart tissue death. Light micrograph of a section through heart muscle tissue in infarction (tissue death) of the heart. This is what causes the pain of a heart attack. A blood clot (thrombus) of a coarse and fibrinous nature is seen. Tissue death in the heart is usually caused by a blood clot or other blockage that blocks or reduces blood flow in the coronary arteries that supply oxygenated blood to the heart muscle. Fibrin is an insoluble protein that forms the essential part of a blood clot. Magnification unknown.
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