Lack of factor VIII causes classic hemophilia; other types are caused by deficiency of factor IX or XI.

在典型的血友病中缺乏的是凝血因子VIII；其它的血友病是因缺乏凝血因子IX或XI。

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Lack of factor VIII causes classic hemophilia; other types are caused by deficiency of factor IX or XI.

在典型的血友病中缺乏的是凝血因子VIII；其它的血友病是因缺乏凝血因子IX或XI。

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