CTLA4 and myasthenia gravis: The results are summarized in Figure 1(g) and indicated that the mean frequency of Treg cells and CTLA-4+ Treg in MG patients (2.35 ± 0.42% and 0.91 ± 0.31%, respectively) was significantly lower than that in healthy donors (4.70 ± 0.76% and 1.90 ± 0.63%, respectively).