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A. Percentage of males in 13 inbred mice strains that emitted USVs when they encountered a female. These percentages were not independent of strain on a chi-square test (p<0.05). B. Call latency (s.) for males from 13 inbred mice strains upon encountering a female. For individuals that did not emit any USVs, latency was recorded as 900 sec. Latency showed an effect of strain using ANOVA (p<0.001). Data indicate means ± standard error.
