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f9

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Official Full Name
coagulation factor IX
Background
Factor IX (or Christmas factor) (EC 3.4.21.22) 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.
Synonyms
coagulation facto; F9; FIX; P19; PTC; HEMB; MGC129641; MGC129642; coagulation factor IX; FIX F9; factor 9; Christmas factor; OTTHUMP00000024154; plasma thromboplastic component; Christmas disease; Factor IX; hemophilia B; F9 p22; factor IX F9; serine protease; plasma thromboplastin component; THPH8