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Thermopsin This family consists of several thermopsin proteins from archaebacteria. Thermopsin is a thermostable acid protease which is capable of hydrolysing the following bonds: Leu-Val, Leu-Tyr, Phe-Phe, Phe-Tyr, and Tyr-Thr. The specificity of thermopsin is therefore similar to that of pepsin, that is, it prefers large hydrophobic residues at both sides of the scissile bond.
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