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Freezing scores to the context (A) and to the audible cue (B) of the young and old mice pre-injected with L-655,708 or vehicle (DMSO). n = 10 in the groups of young mice; n= 6 in the groups of old mice. All values show means ± SD. **, P< 0.01; ***, P<0.001; ns, not significant. P-values were obtained using Kruskal-Wallis tests plus Dunn’s multiple comparison tests in A and B.
