Representative images showing sheep IgG immunoreactivity in glomeruli of Tmsb4x+/y (A) and Tmsb4x−/y (B) mice injected with nephrotoxic serum (NTS). (C) Quantification of mean fluorescence in 30 glomeruli per sample (Tmsb4+/y + NTS, n = 9; Tmsb4x−/y + NTS, n = 6). Plasma titers of murine IgG subclasses (D, IgG1; E, IgG2a; F, IgG2b; G, IgG3) against sheep IgG in control, not immunized Tmsb4x+/y mice (n = 5) and in Tmsb4x+/y (n = 9) and Tmsb4x−/y (n = 6) mice 21 days after NTS injection. Data are presented as mean ± SEM. Bar = 20 μm, *P ≤ 0.05, ** P ≤ 0.01, *** P ≤ 0.001.