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Male–female social interaction. A 3‐min session measured parameters of direct interaction of a male (n = 12 for each strain) with a sexually receptive female of the same strain. USV rate (A) and duration (B), sniffing frequency (C), and sniffing duration (D). Significant differences between B6 and FVB (p < 0.05*, p < 0.01**); B6 and CD‐1 (p < 0.01##); FVB and CD‐1 (p < 0.05$, p < 0.01$$). Data are expressed as median ± 1st and 3rd interquartile.
