thrombin blood-clotting enzyme bound to argatroban drug molecule. 3d rendering. thrombin converts soluble fibrinogen into

pdb1ppb thrombin alpha coagulation factor blood activated prothrombin plasma cascade thrombus clot fibrin clotting vitamin antithrombin inhibitor direct anticoagulant thinner hirudin argatroban melagatran ximelagatran dabigatran structure peptide protein 3d rendering amino acid molecule polypeptide polymer atoms science scientific disease health molecular model