Constituent of the membrane attack complex (MAC) that plays a key role in the innate and adaptive immune response by forming pores in the plasma membrane of target cells (PubMed:9634479, PubMed:9212048, PubMed:26841934). C9 is the pore-forming subunit of the MAC (PubMed:4055801, PubMed:26841934).
C9 cDNA / gene is a gene with protein product which located on 5p13.1. The C9 gene is conserved in chimpanzee, Rhesus monkey, dog, cow, mouse, rat, and frog. 236 organisms have orthologs with human gene C9.