The product is a serine protease, which cleaves the 16 Arginine - 17 Glycine bond in fibrinogen. The MW of the product is approximately 43,000 g/mol-1, and it contains 231 amino acids. Bothrops atrox moojeni. https://www.creativebiomart.net/therapeutic-proteins/p/212/serine-protease-derived-from-the-venom-of-a-pit-viper-bothrops-atrox-moojeni/