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			File:Coagulation_full.svg\|Diagram of the coagulation cascade
			File:Factor_IX.png\|Structure of Factor IX protein
			File:F9_gene_location.png\|Location of the F9 gene on the X chromosome
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'''Factor IX''' is a protein that plays a crucial role in the [[blood clotting]] process. It is one of the [[serine proteases]] involved in the [[coagulation cascade]], which is a series of reactions that ultimately leads to the formation of a [[blood clot]]. Factor IX is produced in the [[liver]] and circulates in the bloodstream in an inactive form until it is needed for clotting.

== Function ==

Factor IX is activated by [[Factor XIa]] in the presence of [[calcium ions]] and [[phospholipids]]. Once activated, Factor IX (now referred to as Factor IXa) interacts with [[Factor VIII]] to activate [[Factor X]]. This is a critical step in the coagulation cascade, as Factor X goes on to convert [[prothrombin]] into [[thrombin]], which then converts [[fibrinogen]] into [[fibrin]] – the main component of a blood clot.

== Clinical significance ==

Deficiency in Factor IX causes [[Hemophilia B]], also known as Christmas disease. This is a rare genetic disorder that prevents blood from clotting properly, leading to excessive bleeding. Hemophilia B is less common than [[Hemophilia A]], which is caused by a deficiency in Factor VIII.

Treatment for Hemophilia B involves replacing the missing Factor IX. This can be done through infusions of plasma-derived Factor IX, recombinant Factor IX, or a Factor IX concentrate. Gene therapy is also being explored as a potential treatment option.

== See also ==

* [[Blood clot]]
* [[Coagulation]]
* [[Hemophilia B]]
* [[Factor VIII]]
* [[Factor X]]
* [[Prothrombin]]
* [[Thrombin]]
* [[Fibrinogen]]
* [[Fibrin]]

[[Category:Blood]]
[[Category:Coagulation system]]
[[Category:Proteins]]
[[Category:Genetic disorders]]
[[Category:Hemophilia]]

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Factor IX - Revision history

Prab: CSV import

Prab: CSV import