سرپین - ویکی‌پدیا، دانشنامهٔ آزاد

Figure 1: Recent serpin structures: the structure of the serpin protein Z-dependent inhibitor ( PZI - in green/magenta) in complex with protein Z (cyan/red). Protein Z itself is a catalytically inactive serine protease that functions in this instance as a co-factor. The PZI / Protein Z complex is a highly effective inhibitor of the coagulation protease factor Xa."