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Delay and trace training. Percent freezing (mean ± SEM) during training for the (A) delay and (B) trace fear conditioning paradigms. The gray bars represent the timing of the 30-sec CS, and the dashed lines represent the timing of the 2-sec US. Data are shown in 30-sec bins to match the CS and trace interval durations. Significant differences between the strains and training types are described in the text.
