ab11863-50ug，Anti-C4 antibody

Complement component 4 (C4) is a significant protein in the complement system also known as C4 complement. C4 has a molecular mass of approximately 206 kDa and mainly expresses in the liver. It is present in the blood plasma. C4 plays an important role in the immunological response and activates classical and lectin complement pathways. It serves a mechanical function by binding to pathogen surfaces and facilitating the cleavage that leads to the downstream activation of the complement cascade. There's a C4 ELISA test that allows for quantifying C4 levels in serum which is important for clinical diagnostics./ Biological function summary/ Complement C4 participates in the immune defense by marking pathogens for destruction and enhancing phagocytosis. C4 is a part of a complex with other complement proteins like C3 and C1 to initiate the formation of the C3 convertase enzyme. This action amplifies the immune response leading to the clearance of microorganisms and apoptotic cells. C4 also plays a role in regulating the inflammation process maintaining homeostasis in the immune system./