Fig. 6
From: The influence of HK2 blood group antigen on human B cell activation for ABOi-KT conditions
The activation of T follicular helper cells for B cells*. Tfh: T follicular helper, TCR: T cell receptor, MHC II: major histocompatibility complex class II, ICOS: Inducible costimulator, ICOSL: ICOS ligand, CD40L: CD40 ligand, IL: interleukin, IL-R: interleukin receptor, CSR: class switch recombination, SHM: somatic hypermutation, AID: activation-induced cytidine deaminase, UNG: uracil-N-glycosylase. * The figure was drawn as Durandy er al [35] reported with some modification