Moreover, surface-expressed PD-L1 was also recognized as an important feature of Bregs, which play a critical role in regulating humoral immunity mediated by CD4+CXCR5+PD-1+ follicular helper T cells [30]

Moreover, surface-expressed PD-L1 was also recognized as an important feature of Bregs, which play a critical role in regulating humoral immunity mediated by CD4+CXCR5+PD-1+ follicular helper T cells [30]. 40)…