MuSK myasthenia gravis patients with HLA-DRB1*14 presented with increased serum levels of IgG4 autoantibodies and IL-10 concentrations (69), and IL-10 also plays a role in animal models of pemphigus vulgaris (70–72) and MuSK myasthenia gravis (73). The gene discussed is HLA-DRB1; the disease is pemphigus vulgaris.