DERP1 Protein, a thiol protease, selectively cleaves target proteins with distinct structural features, favoring substrates with a large hydrophobic side chain in the P2 position or basic residues. This specificity underscores DERP1s functional significance in cellular processes. DERP1 Protein, Dermatophagoides pteronyssinus (C132A, N150E, HEK293, His) is the recombinant DERP1 protein, expressed by HEK293 , with C-His labeled tag and C132A, N150E mutation.