Factor X Deficiency, also known as stuart-prower factor deficiency, is related to prothrombin deficiency, congenital and vitamin k deficiency bleeding. An important gene associated with Factor X Deficiency is F10 (Coagulation Factor X), and among its related pathways/superpathways are Metabolism of proteins and Response to elevated platelet cytosolic Ca2+. Affiliated tissues include liver and skin, and related phenotypes are prolonged prothrombin time and reduced factor x activity