Serine protease. Causes an allergic reaction in human. Binds to IgE of patients with bronchial asthma (PubMed:10231324, PubMed:14510716, PubMed:18760997). Binds to IgE in 24% of the 41 patients tested (PubMed:14510716). Belongs to the peptidase S8 family.