CD4 and myasthenia gravis: It is reported that the frequency of CD4+CXCR5+ [97, 98], CD4+CD45RO+CXCR5+ [98], CD4+CXCR5+PD-1hi, and CD4+CXCR5+ICOShi T cells in the peripheral blood from MG patients was higher compared to healthy subjects.