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HLA antigen

noun Immunology.
  1. an antigen of the HLA group, designated by a letter (HLA-A, HLA-B, etc.) according to the chromosome locus on which the controlling HLA gene appears and additionally by a number (HLA-A1, HLA-A2, etc.) according to the order of discovery and identification.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018