Factor IX

（重定向自Benefix）

The blood coagulation and Protein C pathway.

Factor IX (or Christmas factor) (EC3.4.21.22) is one of the serine proteases of the coagulation system; it belongs to peptidase family S1. Deficiency of this protein causes hemophilia B. It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to hemophilia.

单词	Benefix
释义	Benefix 英语百科 Factor IX （重定向自Benefix） Factor IX (or Christmas factor) (EC3.4.21.22) is one of the serine proteases of the coagulation system; it belongs to peptidase family S1. Deficiency of this protein causes hemophilia B. It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to hemophilia.
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