Protein S

Vitamin K-dependent plasma glycoprotein that plays a crucial role in the regulation of blood coagulation. It acts as a cofactor to activated protein C in the degradation of clotting factors Va and VIIIa, helping to prevent excessive clot formation. Protein S is essential for individuals with a risk of developing blood clots, and its deficiency can lead to conditions such as deep vein thrombosis and pulmonary embolism.