AID, activation-induced cytidine deaminase; C/EBPβ, CCAAT/enhancer-binding protein β; FADD, Fas-Associated protein with Death Domain; HGAL, human germinal center-associated lymphoma; SHIP1, SH2 domain containing inositol 5′-phosphatase 1; SOCS1, suppressor of cytokine signaling protein 1.