Emphasis Preaching Journal
Our immune system uses markers...
Illustration
Our immune system uses markers known as histocompatibility antigens to determine whether something is part of us or an invader. Every cell of our body carries these antigens on its surface. Our immune system will attack any cell that has unrecognized antigens. These cells are treated as enemies to be eradicated. When a person needs an organ transplant, a team of doctors attempt to match the histocompatibility antigens of the recipient to that of the donor. The match is never exact. Thus, when the new organ is implanted, the body's immune system goes to work to destroy the invader.