Although no difference was observed in the enzymatic activity of SOD between the groups (Figure 2M; p > 0.05), the gene expression of Sod1, Sod2 and Gpx1 was reduced in the testes of rats with hypothyroidism (Figure 2L), while treatment with Kp10 did not alter this low expression (p > 0.05). This evidence concerns the gene SOD2 and hypothyroidism.