Factor IX (or Christmas factor or Christmas-Eve factor) is one of the serine proteases (EC 3.4.21.22) of the coagulation system; it belongs to peptidase family S1. Deficiency of this protein causes hemophilia B.

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... FACTOR IX (AlphaNine®, Bebulin™, BeneFIX®, Konyne®, Mononine®, Prolifnine®, Proplex® T) is a natural protein, normally present in the blood, that helps blood to clot. A lack of this protein is responsible for hemophilia B (Christmas disease). Factor IX helps to prevent or control bleeding in patients with hemophilia B, treats joint bleeds, or prevents bleeding complications during surgery. Some factor IX products may be used to treat patients with inhibitors to factor VIII or factor VII. A number of factor IX products are available and come from human sources. ...
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Recombinant DNA (sometimes rDNA) is an artificial DNA sequence resulting fro ...
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