c5b9 ELISA kits are assays designed to detect protein complex c5b-9, which is a part of the membrane attack complex (MAC) in the complement system. This complex is usually formed on the surface of cell membranes of pathogens to serve as an effector of the immune system. It causes cells to undergo necrotic cell death by damaging organelles such as mitochondria and the plasma membrane. Reducing the c5b-9 molecules or shedding them from the cell membrane occurs in cancer cells, allowing them to escape cell death. Visit the supplier page for more information about detection range and reactivity.