Predicted to enable cysteine-type endopeptidase inhibitor activity involved in apoptotic process; protease binding activity; and serine-type endopeptidase inhibitor activity. Predicted to be involved in several processes, including cellular response to estrogen stimulus; negative regulation by symbiont of host apoptotic process; and protection from natural killer cell mediated cytotoxicity. Predicted to act upstream of or within several processes, including T cell mediated cytotoxicity; acute inflammatory response to antigenic stimulus; and negative regulation of T cell apoptotic process. Predicted to be located in Golgi apparatus; cytosol; and nucleoplasm. Predicted to be active in cytoplasm and extracellular space. Orthologous to human SERPINB9 (serpin family B member 9). [provided by Alliance of Genome Resources, Apr 2022]