Predicted to enable serine-type endopeptidase inhibitor activity. Predicted to be involved in negative regulation of endopeptidase activity. Predicted to act upstream of or within several processes, including extracellular matrix organization; prostate gland morphogenesis; and regulation of epithelial cell proliferation. Predicted to be located in cytoplasm. Predicted to be active in extracellular space. Orthologous to human SERPINB5 (serpin family B member 5). [provided by Alliance of Genome Resources, Apr 2022]