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A Kunitz-type trypsin inhibitor was purified from Leaf-nosed viper venom and the primary structure determined by peptide analysis. In relation to other trypsin inhibitors, the protein has an extended C-terminal segment and a distinct pattern of residue alterations at the functionally important contact sites with proteases.
Upon investigation of pig intestinal peptides for effects on the relcuse of endocrine hormones from the isolated perfused rat pancreas, we reported earlier that glucose-stimulated insulin release was inhibited by PEC-60, a peptide with marked sequence similarity to PSTI (pancreatic secretory trypsin inhibitor). Continuing this study we found a polypeptide, which inhibited glucose-induced insulin release...
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