Predicted to enable serine-type endopeptidase inhibitor activity. Predicted to be involved in negative regulation of endopeptidase activity. Predicted to be active in extracellular space. Human ortholog(s) of this gene implicated in heparin cofactor II deficiency. Orthologous to human SERPIND1 (serpin family D member 1). [provided by Alliance of Genome Resources, Apr 2022]