Serpin B9 is a protein that in humans is encoded by the SERPINB9gene.[5][6][7]
PI9 belongs to the large superfamily of serine proteinase inhibitors (serpins), which bind to and inactivate serine proteinases. These interactions are involved in many cellular processes, including coagulation, fibrinolysis, complement fixation, matrix remodeling, and apoptosis (Sprecher et al., 1995).[supplied by OMIM][7]
^Sun J, Stephens R, Mirza G, Kanai H, Ragoussis J, Bird PI (Feb 1999). "A serpin gene cluster on human chromosome 6p25 contains PI6, PI9 and ELANH2 which have a common structure almost identical to the 18q21 ovalbumin serpin genes". Cytogenet Cell Genet. 82 (3–4): 273–7. doi:10.1159/000015118. PMID9858835. S2CID23659776.