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Photomicrographs of spleen histopathology. The images (magnification 4×, 10×) represent the histopathological sections of the spleen. Abbreviations: Con, control group; M8: the mixture of eight common metals (Pb + Cd + Hg + Cu + Zn + Mn + Cr + Ni); M5: the mixture of five non-essential metals (Pb + Hg + Cd + Ni + Cr); Cr, chromium; rp, red pulp; wp, white pulp; t, trabeculae; ca, central artery; gc, germinal center.
