MG-associated susceptibility genes such as those encoding cytotoxic T lymphocyte-associated protein (CTLA)-4, tumor necrosis factor (TNF)-α, protein tyrosine phosphatase non-receptor type (PTPN)22, and interleukin (IL)-10 have been implicated in other autoimmune diseases (Avidan et al., 2014). The gene discussed is CTLA4; the disease is myasthenia gravis.