Thromboplastinogen

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thromboplastinogen --> factor viii

A coagulation (clotting) factor. Classic haemophilia (haemophilia A) is due to a congenital deficiency in the amount (or activity) of factor VIII. Factor VIII is also known as antihemophiliac factor (aHF) or antihemophiliac globulin (aHG). The gene for factor VIII (that for classic haemophilia) is on the x chromosome so females can be silent carriers without symptoms and males can be haemophiliacs.