Antibody. Illustration of an immunoglobulin antibody molecule. This Y-shaped molecule has two arms that can bind to specific antigens, for instance viral or bacterial proteins. In doing this it marks ...

Antibodies are disease-fighting proteins that play a crucial role in the immune system. Antibodies recognize infectious invaders, such as bacteria and viruses, and help the body eliminate them.

Immunoglobulin A (IgA) nephropathy, also called Berger’s disease, is an autoimmune disease that affects your kidneys. IgA is an antibody. Antibodies are proteins made by your immune system. They ...