Human leukocyte antigen complex

The Human Leukocyte Antigen complex or HLA complex is a group of proteins that "helps the immune system distinguish the body's own proteins from proteins made by foreign invaders such as viruses and bacteria". It is the human version of the Major Histocompatibility Complex (MHC), which is also found in certain non-human species.

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 * Histocompatibility complex - Genetics home reference - US Library of Medicine