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HPLC analysis of (A) serotonin and (B) dopamine in the brain tissues of rats treated with hydroponically (HyL) and soil-grown (SoL) lettuce. Values expressed as means (n = 3) ± SD with *p < 0.05 in comparison with Rivastigmine representing “a”, SoL 200 mg/kg representing “b”, SoL 100 mg/kg representing “c”, SoL 50 mg/kg representing “d” Alzheimer’s control representing “e” and normal control representing “f” with all respective concentrations of HyL and controls
