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Hirudin is an anticoagulant substance extracted from the buccal glands of the medicinal leech (Hirudo medicinalis). This natural polypeptide inhibits thrombin, an enzyme crucial for blood clotting.12

Historically, leeching was a common practice for bloodletting. Today, it is occasionally used in medicine, particularly after reattachment surgeries or tissue grafts, to restore blood flow and prevent congestion by promoting continued bleeding from the site. Hirudin has also been produced commercially through genetic engineering.2

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2 Britannica Sources
  1. hirudin
  2. leeching

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