In Tm+MG group, the percentage of Breg/CD19+B cell increased (Figure 3C), while the percentage of B10/CD19+B cell decreased (Figure 3D) (p < 0.05), indicating that with the emergence or exacerbation of MG symptoms, B cell count in the peripheral blood did not significantly change, but AChR-Ab content and the percentage of Breg cells increased while the percentage of B10 cells decreased. This evidence concerns the gene CD19 and myasthenia gravis.