Structure of<unk>  in complex with thrombin.<unk>  is a naturally occurring peptide in the salivary glands of blood-sucking leeches (such as Hirudo medicinalis) that has a blood anticoagulant property. This is fundamental for the leeches’ habit of feeding on blood, since it keeps a host's blood flowing after the worm's initial puncture of the skin.
Hirudin
Bivalirudin
Lepirudin
Argatroban
Palladin
Anistreplase
Tinzaparin sodium
Lusutrombopag