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A-D: Effect of Nrf2, HO-1, Nqo-1 or scramble siRNA on propofol-induced cytoprotection, after at 24 h after treatment with H2O2. Cytotoxicity was measured using an LDH assay. n = 3. The data are expressed as mean ± SEM. *P < 0.05, **P < 0.01. N.S., not significant.
