hirudin protein molecule. anticoagulant protein from leeches that prevents blood clotting by inhibiting thrombin. topically used

pdb4mlf hirudin hirudine thrombin saliva medicinal leech leeches hirudo medicinalis anticoagulant blood worm sucker coagulation clotting recombinant skin hematoma varicose vein veins desirudin lepirudin structure peptide protein amino acid molecule polypeptide polymer atoms science scientific disease health molecular model