(a) The control rat showing no BAX immune-reactive cells in the liver tissue. (b) A group treated with 500 ppm chitosan nanoparticles showing weak positive expression of BAX. (c) A group treated with 1000 ppm chitosan nanoparticles showing strong positive immune expression. (d) A group treated with 500 ppm silver nanoparticles showing weak positive expression of BAX. (e) A group treated with 1000 ppm silver nanoparticles showing strong positive immune expression. (f) A group treated with 500 ppm chitosan-silver nanoparticles showing weak expression of BAX. (g) A group treated with 1000 ppm chitosan–silver nanoparticles showing weak expression of BAX. (h) A group treated with 500 ppm lavender nanoparticles showing very weak immunoreaction of BAX. (i) A group treated with 1000 ppm lavender nanoparticles, note very weak immune-expression (BAX ×400)