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Determination of the nitric oxide (NO) levels in hippocampus, expressed in µmol/g of tissue in male and female rats after 8 weeks of treatment with 0.9% of NaCl (Control), 0.25 mg/kg (Ni-0.25), 0.5 mg/kg (Ni-0.5), and 1 mg/Kg (Ni-1) of Ni. Results are represented as mean ± SEM. The significance level is 0.05. ** p < 0.01, *** p < 0.001.
