Fig. 2. Morphology of the primary microglia and Se@SiO₂ effects of different concentrations of H₂O₂ on microglia viability. (a) Morphology of the primary microglia observed by optical microscopy (100×). (b) Immunohistochemistry of Iba-1 of the primary microglia (400×). (c) The effects of different concentrations of Se@SiO₂ on primary microglia viability. (d) The effects of different concentrations of H₂O₂ on microglia viability. Data are expressed as mean ± SD, *P < 0.05 vs. 0 group (n = 6).