Human thrombin is a platelet-activating factor also known under the brand names Artiss, Evarrest, Evicel, Evithrom, Tachosil, Tisseel and Vistaseal. Human thrombin is purified human thrombin, a highly specific serine protease that acts on fibrinogen to fibrin, leading to the formation of a blood clot. It also acts on coagulation factor XIII to activate it and establish cross-linking of fibrin producing a clot. It is used as a topical application to a surgical site to minimize bleeding. Human thrombin is metabolized the same way as endogenous thrombin, inactivated by plasma inhibitors.

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