Predicted to enable serine-type endopeptidase inhibitor activity. Predicted to be involved in negative regulation of acrosome reaction. Predicted to act upstream of or within negative regulation of peptidase activity. Predicted to be located in extracellular region. Orthologous to human SPINK13 (serine peptidase inhibitor Kazal type 13). [provided by Alliance of Genome Resources, Apr 2022]