题目内容
In an experiment, thrombus formation is studied in areas of vascular damage. After a thrombus forms in an area of vascular injury, the propagation of the thrombus to normal arteries is prevented. Researches identify a substance that diminishes thrombus propagation by binding to thrombin, converting it to a procoagulant that activates protein C. Which of the following substance is most likely to produce this effect_ _
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