CD27 and myasthenia gravis: In general, the TRAF6 expression levels in CD19+ B cells and CD19+CD27+ memory B cells were both significantly higher in MG patients than in HCs (CD19+ B cells: HCs: 0.89 (0.36, 1.45), MG patients: 1.94 (1.018, 3.773), p < 0.01; CD19+CD27+ memory B cells: HCs: 0.27 (0.16, 1.57), MG: 2.25 (0.77, 4.42), p < 0.01) (Fig. 1A, B).