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HLA-B21 (B21) is an HLA - B serotype. B21 is a broad antigen serotype that recognizes the B49 and B50 split antigen serotypes.[1]


  1. ^ Marsh SG, Albert ED, Bodmer WF, et al. (2005). "Nomenclature for factors of the HLA system, 2004". Tissue Antigens. 65 (4): 301–69. doi:10.1111/j.1399-0039.2005.00379.x. PMID 15787720.