Effect of glyceollins on cognitive function in Nrf2 wild-type mice. Nrf2 wild-type C57BL/6 mice (five weeks old, n = 9–15) were pretreated with glyceollins (10 mg/kg bw) 24 h before cognitive function or behavior tests, and then subjected to Y-maze (A); passive avoidance (B); and Morris Water maze (C) tests after injected i.p. with scopolamine (1 mg/kg bw). Values are mean ± SD (n = 9–15). Different alphabetical letters (a, b, c) indicate statistically significant differences.