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Learning performance in quinone reductase 2 knock-out mice (QR2−/−) in the Morris water maze task. A, Escape latencies to find the hidden-platform are shorter for QR2−/− mice (n = 19) than WT (n = 20) on days 2–4 (*p < 0.05, two-way ANOVA). No differences were detected between WT and QR2−/− for the percentage time spent in target quadrant (B) or in the number of platform crossings (C).
