Enables serine-type endopeptidase inhibitor activity. Involved in negative regulation of fibrinolysis and response to organic substance. Located in extracellular space. Used to study acute necrotizing pancreatitis. Biomarker of familial hyperlipidemia. Human ortholog(s) of this gene implicated in COVID-19 and alpha-2-plasmin inhibitor deficiency. Orthologous to human SERPINF2 (serpin family F member 2). [provided by Alliance of Genome Resources, Apr 2022]