HLA-DRB1 and myeloid sarcoma: Given that European HLA-DRB1*15:01 conferred three times the odds of MS compared to African HLA-DRB1*15:01, and without evidence that this finding was due to HLA-DQB1*06:02 (S2 and S3 Tables), we compared the most representative SNP and AA subsequences for European and African HLA-DRB1*15:01 alleles to look for differences.