Figure 3.
Enhanced AID Serine 38 phosphorylation does not increase CSR. (A) Anti-pS38 and anti-AID immunoblot of AID purified with anti-AID antibody from lysates of B cells from WT, AIDS38A, or AID−/− mice. Cells were cultured with IL-4 and LPS for 72 h and treated with 10 mM LiCl (Li+) or NaCl (Na+) for 12 h before analysis. (B) Representative triplicate FACS plots of CSR to IgG1 in WT and AIDS38A B cells from A. Relative percentage of cells expressing IgG1 is in each plot. (C) Summary of CSR to IgG1 in activated B cells from n = 6 individual experiments each in triplicate. Error bars are SE. P-value (*, P < 0.001) was determined by a two-tailed t test assuming unequal variance.