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".https://ghr.nlm.nih.gov/primer/genefamily/hla https://www.merriam-webster.com/dictionary/human%20leukocyte%20antigen 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