Whereas in the kidney, diabetes-induced the protein expression levels of glutathione S-transferase Mu 1 (1.55 fold, p = 0.039) and Zeta 1 (1.86 fold, p = 0.005), peroxiredoxin 3 (1.36 fold, p = 0.001) and 6 (1.67 fold, p = 0.047) and superoxide dismutase 2 (1.24 fold, p = 0.018) compared to levels in kidney of control normal rats (Table B in S1 File). This evidence concerns the gene SOD2 and diabetes mellitus.