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Factor IX is a natural protein, normally present in the blood, that helps blood to clot. A lack of
this protein causes hemophilia B (Christmas disease). Factor IX complex also contains small amounts
of other blood clotting factors.
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Factor IX (nine) is a naturally occurring protein in the blood that helps blood to clot. A
lack of clotting factors can cause uncontrolled bleeding, as the blood is unable to clot properly.
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