HLA-DRB1 and myeloid sarcoma: Antibodies against the EBNA1 GAR region, the anti-EBNA1 IgG at the C-terminus of this fragment (385–420), were found in the MS risk haplotype HLA-DRB1*1501 and deletion of the protective HLA-A*02 allele increased the risk of MS (Marcucci and Obeidat, 2020).