Kunitz-type protease inhibitor 2 is an enzyme inhibitor that in humans is encoded by the SPINT2 gene.[5][6][7] SPINT2 is a transmembrane protein with two extracellular Kunitz domains to inhibit serine proteases. This gene is a presumed tumor suppressor by inhibiting HGF activator which prevents the formation of active hepatocyte growth factor. Mutations in SPINT2 could result in congenital sodium diarrhea (CSD).
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