Predicted to enable serine-type endopeptidase inhibitor activity. Predicted to be involved in negative regulation of endopeptidase activity. Predicted to act upstream of or within hematopoietic progenitor cell differentiation. Predicted to be active in extracellular space. Orthologous to human SERPINB12 (serpin family B member 12). [provided by Alliance of Genome Resources, Apr 2022]