Isoform-specific V(D)J clones analyzed in adult KMT2DMut/+ patients(circles) and age-matched adult controls (triangles). Presented as percent (%) divergent from germline IGH sequence. (A,B, C) IgM, IgG and IgA mutations rates in KMT2DMut/+ patients and controls. IgG mutation rates (B) were significantly lower in 3 of 4 KMT2DMut/+ patients than in controls (*p < 0.05). All data (A,B, C) are present as mean ± standard deviation of the mean.