PSTI SPINK1 ISK1_SHEEP NILGREAKCTNEVNGCPRIYNPVCGTDGVTYANECLLCMENKERQTPVLIQKSGPC Pancreatic secretory trypsin inhibitor 56 This is a trypsin inhibitor, its physiological function is to prevent the trypsin-catalyzed premature activation of zymogens within the pancreas. Serine protease inhibitor Kazal-type 1