The X Factor (UK series 9) The X Factor (UK series 9) The X Factor is a British television music competition to find new singing talent. The ninth series began airing on ITV on 18 August 2012 and ended on 9 December 2012. Dermot O'Leary returned as presenter of the main show on ITV, whilst Caroline Flack and Olly Murs returned to co-present "The Xtra Factor" on ITV2. Louis Walsh, Gary Barlow and Tulisa returned as judges. Nicole Scherzinger was confirmed as the fourth permanent judge after Geri Halliwell, Leona Lewis, Rita Ora, Mel B, Anastacia and Scherzinger herself stood in as guest judges for the
Factor X Miss Audrey Prower (1934). Factor X has been shown to interact with Tissue factor pathway inhibitor. Factor X Factor X, also known by the eponym Stuart–Prower factor, is an enzyme () of the coagulation cascade. It is a serine endopeptidase (protease group S1, PA clan). Factor X is synthesized in the liver and requires vitamin K for its synthesis. Factor X is activated, by hydrolysis, into factor Xa by both factor IX (with its cofactor, factor VIII in a complex known as "intrinsic Xase") and factor VII with its cofactor, tissue factor (a complex known as "extrinsic Xase"). It is