An insufficient concentration or decreased activity of any coagulation factor can cause hemophilia, except factor XII deficiency which is asymptomatic.
任何凝血因子的浓度不够或者活性降低都会引起血友病，一个例外是缺乏因子XII的话，不会有相关症状出现。
Factor xii deficiency
原声例句
Osmosis-血液肿瘤
英语百科
Factor XII
（重定向自Factor xii deficiency）
Coagulation factor XII, also known as Hageman factor, is a plasma protein. It is the zymogen form of factor XIIa, an enzyme (EC3.4.21.38) of the serine protease (or serine endopeptidase) class. In humans, factor XII is encoded by the F12 gene.
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