Predicted to enable serine-type endopeptidase inhibitor activity. Predicted to be involved in antibacterial humoral response and innate immune response. Predicted to act upstream of or within negative regulation of peptidase activity. Predicted to be located in extracellular region. Predicted to be active in extracellular space. Orthologous to human WFDC13 (WAP four-disulfide core domain 13). [provided by Alliance of Genome Resources, Apr 2022]