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PC12 cell survival after quercetin (Qc) treatment (MTT assay).
Qc increases cell survival at lower concentrations (100 and 500 μM) and is neurotoxic at higher concentration (1,000 μM; * indicates analysis of variance). The neurotoxic effects of 1,000 μM of Qc is reversed by co-treatment of z-VDF-fmk (zVf) (**indicates Student's t-test). Data represent the mean ± SD of five independent experiments.
