Predicted to enable serine-type endopeptidase inhibitor activity. Acts upstream of or within extracellular matrix organization; neural tube closure; and placenta development. Located in plasma membrane. Is expressed in several structures, including alimentary system; brain; extraembryonic component; genitourinary system; and sensory organ. Orthologous to human SPINT1 (serine peptidase inhibitor, Kunitz type 1). [provided by Alliance of Genome Resources, Apr 2022]