Following immunization, young JHT.mIg mice with AID deficiency also exhibited an increased in naïve T cells. JHT.mIg.MRL/lpr and its AID-deficient counterpart (3 mice/group) were immunized with NP at 3 months of age and euthanized 2 weeks later. The impact of AID deficiency on the fraction of naïve and memory T cells in CD4+ (A) and CD8+ T (B) cells was similar to that seen in older mice. CD4+ and CD8+ T cells were defined as being naïve (CD44low, CD62high), activated (CD44high, CD62Lhigh), or memory (CD44high, CD62Llow). The error bars represent standard errors. Student’s t-test was performed.