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Coagulogen is a unique protein found in the blood of horseshoe crabs. This protein plays a crucial role in their blood's clotting ability, allowing them to detect and trap bacteria by forming a gel-like clot. This property is vital for the biomedical industry, as it forms the basis of the Limulus amoebocyte lysate (LAL) test, which detects bacterial contamination in medical supplies and injections. The process of blood coagulation in general involves a complex cascade of factors to form a clot and stop bleeding, initiated either extrinsically by tissue factor or intrinsically by factors within the blood vessel.1234

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