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Two types of trypsin inhibitors are found in soy: the Kunitz-type soybean trypsin inhibitor (STI, discovered by Moses Kunitz and sometimes abbreviated as KTI) and the Bowman-Birk inhibitor (BBI). STI is a large (20,100 daltons), strong inhibitor of trypsin, while BBI is much smaller (8,000 daltons) and inhibits both trypsin and chymotrypsin. [3]