Alloantigens

Alloantigens are specific substances found on the surface of cells that vary between individuals of the same species. These are like unique markers or tags. When someone receives a blood transfusion or an organ transplant, their immune system can recognize these alloantigens as foreign if they do not match the recipient's own. This can trigger an immune response, which can lead to rejection of the transfused blood or transplanted organ. Understanding alloantigens is important in medicine to ensure compatibility and prevent rejection during procedures like transfusions and transplants.