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Ig gene features. (A) IgH V and (B) J gene repertoire and (C) IgH CDR3 length of antibodies from mature naive and IgM+ memory B cells. (D) The number of mutations and (E) frequency of mutations of VH, Vκ, and Vλ genes in antibodies from IgM+ memory B cells as calculatedby the number of replacement (R; black bar) and silent (S; white bar) nucleotide exchanges per base pair in FWRs and CDRs. The R/S ratio in each region is indicated.