Fig. 1. Neuronal morphometric changes of dendrites in the hippocampus CA1 area of offspring mice at postnatal day 21 following the exposure of pregnant mice to nano-TiO₂. Letters b and a indicate significant difference between the groups treated with 1 mg per kg BW nano-TiO₂ and the control (p < 0.05); letters c and b indicate significant difference between the groups treated with 2 and 1 mg per kg BW nano-TiO₂ (p < 0.01); letters d and c indicate significant difference between the groups treated with 3 and 2 mg per kg BW nano-TiO₂ (p < 0.05). Values represent mean ± SD (N = 5).