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Behavior in the elevated-zero maze. Mean (±SEM) time (A), distance (B), open-quadrant entrances (C) and head dips (D) in the open quadrants of an elevated-zero maze during a 5-min trial. Significant differences by genotype are indicated as ∗∗∗, P ≤ 0.001; ∗∗, P ≤ 0.01; ∗, P ≤ 0.05.
