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Butorphanol reduces cell viability following OGD/R injury. (A) The safe dose of butorphanol on PC12 cells was detected by CCK-8. *P<0.05 vs. 0 µM. (B) Effect of butorphanol (1–4 µM) on the viability of PC12 cells after OGD/R injury. Data are expressed as the mean ± standard deviation (n=3). *P<0.05, **P<0.01 and ***P<0.001 vs. Control; #P<0.05, ##P<0.01 and ###P<0.001 vs. OGD/R. OGD/R, oxygen glucose deprivation/reoxygenation.
