The histological features were improved in hippocampus of rats treated with ZnSO ( 4 ) + BCNU compared to only BCNU-treated animals .
O O O O O O O O B-OrganismTaxon O O B-ChemicalEntity I-ChemicalEntity I-ChemicalEntity I-ChemicalEntity O B-ChemicalEntity O O O B-ChemicalEntity O O