A complement C4 (also known as a complement component 4, or simply C4) is a test to measure the level of C4 proteins you have in your blood. These proteins play a role in how your immune system ...

Undertaking a study of proteins found in the complement system, an important part of the immune system, of patients with long COVID, researchers have identified a blood protein ‘signature’ that may ...

These findings suggest complement protein levels may be an important biomarker for type 1 diabetes. Disruption of the complement system appears to precede the onset of islet autoimmunity (IA), making ...

Medically reviewed by David Hampton, MD C3G is caused by immune system dysfunction that can lead to kidney issues.When the kidneys don't work as they should, people can experience blood or protein in ...

The story of Q32 Bio, a company that develops therapeutics for inflammatory and autoimmune diseases, started two decades ago. That's when V. Michael Holers, MD, a University of Colorado School of ...

Researchers at the Medical University of Vienna and the Medical University of Innsbruck discovered that SARS-CoV-2 hijacks three important host proteins that dampen the activity of the complement ...