4-Ketopinoresinol, a novel naturally occurring ARE activator, induces the Nrf2/HO-1 axis and protects against oxidative stress-induced cell injury via activation of PI3K/AKT signaling - Chen, H H; Chen, Y T; Huang, Y W; Tsai, H J; Kuo, C C (Free Radic Biol Med, 2012)