The human body uses Human Leukocyte Antigen (HLA) markers to identify which cells belong in your body and which do not belong, via the recognition of antigens. Antigens are molecules capable of inducing an immune response, although not all do this. Antigens that belong in the body are recognized as ‘self’, and antigens that are not ‘self’ are recognized as ‘foreign’. As part of the Major Histocompatibility Complex (MHC), HLA proteins play an essential part in this process, making sure that cells and molecules that belong in your body are unharmed, while those recognized as foreign, such as viruses, pathogens, and bacteria, are destroyed and removed.
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