S 2 The anticoagulation system Cell reticuloendothelial system 2. Body fluid (I)antithrombin III(AT-lll, liver) 2) Protein C (3) tissue factor pathway inhibitor (TFPD1. Cell reticuloendothelial system 2. Body fluid (1) antithrombin Ⅲ (AT-Ⅲ,liver): (2) Protein C (3) tissue factor pathway inhibitor (TFPI) §2 The anticoagulation system