factor IX

factor-ix的词性：
n.（名词）

1. A protein substance in blood plasma that participates in and is essential for the blood-clotting process. A deficiency of this factor is the cause of Christmas disease.
克雷斯马斯因子：血液因子中参与血液凝固且不可缺少的蛋白质物质。这种因子的不足是导致乙型血友病的原因