Enables heparin binding activity and serine-type endopeptidase inhibitor activity. Involved in several processes, including dense core granule biogenesis; embryo implantation; and negative regulation of blood coagulation. Located in extracellular space; membrane; and neuronal cell body. Biomarker of brain edema and hypertension. Human ortholog(s) of this gene implicated in Alzheimer's disease. Orthologous to human SERPINE2 (serpin family E member 2). [provided by Alliance of Genome Resources, Apr 2022]