HLA-DPB1 and myasthenia gravis: In our previous work we identified a unique “HLA signature” spanning the class II region of the MHC in OP-MG subjects (Nel et al., 2017) (Figure 3C) and the gene-based analysis in the present study also identified association signals in this region (HLA-DPA1 p = 0.015 and HLA-DPB1 p = 0.033).