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PET scans of the human heart showing the effect of a blood clot. The scan on the right shows an undissolved clot has severely restricted blood flow (see mid-section) so that much of the muscle wall is not metabolizing. The scan on the left, taken four days later, demonstrates the effects of t-PA (a protein called tissue-type plasminogen activator) which is instrumental in dissolving fibrin. The clot has dissolved and metabolism has been restored in all but the left side of the heart.
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