Fibronectins (FNs) are dimeric glycoproteins that adopt a globular con-formation when present in plasma and solution and an extended confor-mation in the extracellular matrix. Factor XII (FXII) is a zymogen of the proteolytically active FXIIa that plays a role in thrombus stabiliza-tion by enhancing clot formation and in inflammation by enhancing bradykinin formation.