Abbreviation for Human Leukocyte Antigen, a group of proteins on cell surfaces that help the immune system distinguish between self and non-self cells. Critical for organ transplant compatibility.
Acronym from 'Human Leukocyte Antigen,' with 'leukocyte' from Greek 'leukos' (white) and 'kytos' (cell), and 'antigen' from 'anti-' (against) plus 'gen' (producer). The system was discovered in the 1950s during tissue transplantation research.
HLA typing is like a molecular fingerprint - your specific combination is so unique that finding a perfect match outside your family is about one in 100,000, which is why organ donor registries need to be enormous. Interestingly, people tend to be attracted to partners with different HLA types, possibly an evolutionary mechanism to ensure genetic diversity in offspring.
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