It was called ‘complement’ because it aided the antibacterial activity of antibodies. However, it is now known that the complement system can be activated early in an infection without the presence of ...

The renin–angiotensin system (RAS), the complement system and the kallikrein–kinin system (KKS) each consists of a large number of distinct plasma and membrane-bound proteins and receptors that can ...

Long Covid patients suffer from chronic symptoms such as fatigue or shortness of breath. As researchers have discovered, this is to some extent due to a part of our immune system called the complement ...

The complement system is an essential part of the innate immunity that is involved in the elimination of pathogens as well as participating in the body’s immune surveillance against cancer. However, ...

C3 glomerulopathy (C3G) and immune complex membranoproliferative glomerulonephritis (IC-MPGN) are rare kidney conditions caused by an overactive complement system, part of the immune system. C3G ...