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Baseline and cue-induced freezing following vicarious conditioning. Vicarious freezing (A) 15 min and (B) 24 h post-conditioning. Data are presented as the mean ± std. error. Genotypes are arranged on the abscissa using the rank-order of means for cued-induced freezing. N=16–24 mice per genotype (balanced across sex). + = B6 > all other strains, P<0.0001; ƒ = BALB/BTBR/ND4 > DBA2/FVB, P<0.0001; # = BALB>ND4, P=0.002; * = Cued > Baseline, P<0.05.
