The trypsin inhibitors as a group form one of the major anti-nutritional factors in soybean [Glycine max (L.) Merrill] seed. Several different trypsin inhibitors have been reported to be present in soybeans. However, much of the soybean trypsin inhibitor activity is thought to be due to the protein SBTI-A2 which is generally known as the Kunitz trypsin inhibitor.
Hymowitz, T.; Orf, J. H.; Kaizuma, N.; and Skorupska, H.
"Research notes: Screening the USDA soybean gennplasm collection for Kunitz trypsin
Soybean Genetics Newsletter: Vol. 5
, Article 8.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol5/iss1/8