CXCR5 and myasthenia gravis: Tacrolimus suppressed CD4+ regulatory and helper T cells in MG, such as Tregs (CD4+CD25+FOXP3+), peripheral blood Tfh (Tfh-like cells: CD4+CXCR5+), and follicular Tregs (CD4+CXCR5+FOXP3+) [59].