Vitamin K–Dependent Protein S : Beyond the Protein C Pathway
Protein S is a vitamin K–dependent plasma glycoprotein circulating in plasma at a concentration of around 350 nM. Approximately 60% of protein S in human plasma is bound to the complement regulatory protein C4b-binding protein (C4BP) in a high-affinity, high-molecular-weight complex. Protein S in plasma has multiple anticoagulant properties and heterozygous protein S deficiency is associated with
