Welcome to the PGA TOUR career site! When most people think of the PGA TOUR, they envision famous golfers, exciting tournaments, and the TOURâs generous support of more than 3,000 charities. We are all of these things, but thereâs much more to the PGA TOUR than meets the eye.
An antigen is a substance that enters the body and stimulates the production of an antibody to fight what the immune system perceives as an invader. Antigens can be toxins, bacteria, foreign blood cells and the cells of transplanted organs. Other antigens, called autoantigens, or self-antigens, are usually normal proteins in the body that are targeted by the immune system of lupus patients as foreign bodies. 1  In other words, normal tolerance of these autoantigens has been lost in lupus patients, mainly to genetic and environmental factors.
Antibodies are proteins produced by the immune system that bind to a target antigen on the cell surface. The immune system normally uses them to fight pathogens. Each antibody is specific to one or a few proteins. Those that bind to tumor antigens treat cancer. Cell surface receptors are common targets for antibody therapies and include CD20, CD274 and CD279.