HLA-DRB1 and myasthenia gravis: When comparing allele frequencies between our myasthenic cases and the control group (Romaniapop2), at the two-digit level, we found positive associations at HLA-B, DRB1 and DQB1 loci between the following alleles and MG: the strongest were with the alleles B*47 and B*73, followed by B*08, DRB1*16 and DQB1*05, while the weakest was with B*40.