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.
An antibody is a protein that is synthesized by an animal in response to the presence of a foreign substance in our body, called an antigen.