**5. Conclusions**

From a toxicological point of view, this study shows that repeated *in vivo* exposure to low doses (0.004, 0.4 and 2.29 mg/kg bw/day) of TERB led to low-level DNA instability in kidney and non-parenchymal and parenchymal liver cells of adult male Wistar rats. An influence of applied low doses on GPx activity in kidneys was detected. Such results could point to the possible role of GPx as a key enzyme in kidney protection from hazardous products of free radical reactions. They can also reflect the response to increased oxidative stress.
