Suppression of NADPH oxidase- and mitochondrion-derived superoxide by Notoginsenoside R1 protects against cerebral ischemia-reperfusion injury through estrogen receptor-dependent activation of Akt/Nrf2 pathways - Meng, X; Wang, M; Wang, X; Sun, G; Ye, J; Xu, H; Sun, X (Free Radic Res, 2014)