Predicted to enable protease binding activity and serine-type endopeptidase inhibitor activity. Predicted to be involved in negative regulation of endopeptidase activity and protection from natural killer cell mediated cytotoxicity. Predicted to be active in extracellular space. Orthologous to several human genes including SERPINB4 (serpin family B member 4). [provided by Alliance of Genome Resources, Apr 2022]