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Fear conditioning responses measured on day 25 in contexts A (left panel) and on day 24 in context B (right panel). The two-way ANOVAs showed significant effects of shock, isoflurane, and an interaction between the two factors (All P<0.05). The asterisks indicate significant difference between the 15 shock/0% isoflurane group and each of the other three groups (*P<0.01; **P<0.001).
