这个词是什么意思？
A vitamin-K dependent zymogen present in the blood, which, upon activation by thrombin and thrombomodulin exerts anticoagulant properties by inactivating factors Va and VIIIa at the rate-limiting steps of thrombin formation.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D011486 · MeSH 2026。
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